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Col de la Traversette

The Col de la Traversette is a high pass in the at an elevation of 2,947 metres (9,669 ft), situated on the border between the French department of and the Italian . It connects the valleys of Abriès-Ristolas in and Crissolo in , offering panoramic views over the Queyras Regional Nature Park and the upper . Historically significant as a and route, the pass is most notably proposed as the crossing point used by Carthaginian general Barca in 218 BC to invade during the Second Punic War, leading an army of tens of thousands of soldiers, horses, and war elephants over treacherous terrain. Geographically, the pass lies within a rugged environment characterized by steep slopes, glacial remnants, and high-altitude meadows, accessible primarily by hiking trails from either side, with no paved road crossing. Its location at the western edge of the watershed makes it a natural divide between the Mediterranean-influenced French side and the Italian plains, contributing to its strategic importance in ancient and . In the 15th century, a short was constructed through the pass to facilitate , underscoring its enduring role in regional commerce. The Hannibal connection gained modern scientific support through multidisciplinary investigations beginning in the 2010s, including geological surveys identifying a ancient matching descriptions by ancient historians and , and archaeobiological analysis of a nearby mire revealing soil layers disturbed around 218 BC. These layers contain elevated levels of bacteria associated with manure, alongside traces of human and animal activity consistent with a large army's passage, including potential feces and compacted sediment from thousands of troops and pack animals. Further evidence includes geochemical signatures and microbial DNA suggesting the presence of herbivores and possibly elephants, dated precisely to the Second Punic War era via radiocarbon analysis. Today, the pass attracts hikers and historians, serving as a testament to one of antiquity's most audacious military feats while highlighting ongoing debates in .

Geography

Location and Borders

The Col de la Traversette is situated in the , a subrange of the Western Alps, marking the international border between and . On the French side, it lies in the department, adjacent to the Queyras Natural Regional Park, while the Italian side falls within the region in the Val Varaita valley. This positioning makes it a key trans-Alpine passage, historically considered one possible route for Hannibal's crossing during the Second Punic War. Geographically, the pass is located at approximately 44°42′N 7°04′E. It stands in close proximity to prominent peaks such as , which rises to 3,841 meters and dominates the southern horizon, serving as a natural landmark for the region. The pass functions as a divide, separating the upper Guil River valley to the northwest in from the upper Po River valley to the southeast in , channeling drainage toward the Mediterranean and Adriatic seas, respectively. The high-alpine environment at Col de la Traversette features severe climatic conditions, with heavy snowfall and sub-zero temperatures rendering the pass impassable during harsh winters. Accessibility improves in summer, when milder weather allows for pedestrian and traversal, though sudden storms and high winds remain common risks.

Elevation and Topography

Col de la Traversette stands at an of 2,947 meters (9,669 feet) above , making it a high pass that remains unsuitable for vehicular due to its rugged, unpaved . This altitude places it among the more elevated crossings in the , with the pass forming a narrow saddle-like depression between adjacent ridges that facilitates limited foot or traversal. The topography features steep ascents from both the and sides, characterized by rocky outcrops, extensive slopes, and remnants of past glaciation that contribute to its challenging profile. Slopes often exceed 35–45 degrees in gradient, with loose debris and occasional avalanche-prone areas adding to the terrain's severity above the treeline. Glacial activity has shaped the surrounding U-shaped valleys, steepening the approaches and leaving behind moraines and polished that define the pass's immediate landscape. Geologically, the area consists primarily of metamorphic rocks from the Penninic nappes, including and metabasalt formations that form the core of the ' structure. These rocks, part of the Dora-Maira Unit within the Penninic Domain, exhibit evidence of intense tectonic deformation and past processes typical of the western . Weather patterns at the pass are influenced by its high elevation and location, featuring frequent , prolonged cover from October through June, and strong exposure to prevailing westerly winds that bring moist Atlantic air. These conditions often result in rapid weather shifts, with winter accumulation exceeding several meters and summer thaws limited by persistent cold snaps.

Access and Recreation

Hiking and Trails

The Col de la Traversette offers challenging hiking opportunities primarily via footpaths from both the French and Italian sides, attracting experienced trekkers seeking high-alpine terrain in the Cottian Alps. Access from the French side typically begins at the parking area of La Roche Écroulée near Ristolas in the Queyras Regional Natural Park, at approximately 1,780 meters elevation, involving a steep ascent through the Ristolas-Mont Viso Nature Reserve. The route gains about 1,170 meters to reach the pass at 2,947 meters, passing rocky outcrops and potential snow patches before arriving at the historic tunnel entrance. From the Italian side, hikes start from Pian del Re at around 2,020 meters, following marked trails such as the Giro del Viso that traverse open plains before climbing to the col via slopes and exposed ridges. These ascents generally take 5 to 6 hours , depending on conditions, with total distances of 10 to 12 kilometers one-way and elevation gains of approximately 930 meters. Trails are classified as T4 to T5 in the hiking scale, indicating demanding terrain that requires sure-footedness, occasional use of hands for balance, and navigation through loose and areas of height exposure without fixed protections. Modern paths often overlap briefly with ancient mule tracks used for centuries, adding a layer of historical intrigue to the route. Popular routes include circuits combining elements from both sides or nearby cols like Col des Embrasures, typically 12 to 15 kilometers with cumulative elevation changes of around 800 to 1,000 meters, completed in 6 to 8 hours. Another option is the extension to the Buco di Viso tunnel, enhancing the cross-border experience. Trails are generally open from mid-June to mid-October, but seasonal snow can cause closures, particularly in or late fall; hikers should check with local park authorities for current conditions as of 2025. Safety is paramount due to the remote location and variable weather; hikers should possess experience, carry essential gear like maps, compasses, headlamps for the unlit , and sufficient , as no facilities exist en route. Rapid changes in alpine conditions, including , thunderstorms, and slippery icy sections near the pass, demand vigilant weather monitoring via apps or ranger stations. Cross-border hiking requires no special permits within the , but adherence to rules—such as staying on marked paths to protect fragile ecosystems—is mandatory, with fines for violations. Novice hikers are advised against attempting the pass without prior high-altitude preparation.

Historical Infrastructure

The Monte Viso Tunnel, known in French as the Tunnel de la Traversette and in Italian as the Buco di Viso, is a approximately 75-meter-long pedestrian passage excavated through the rock at an elevation of approximately 2,880 meters, just below the Col de la Traversette. Constructed between 1478 and 1480, it was commissioned jointly by King of and Ludovico II, Marquis of , to ease the transport of goods and military personnel between the region in and the in what is now . The project was overseen by engineers Martino d'Albiano and Baldassarre da Piasco, who directed manual excavation efforts using picks and chisels in the hard Alpine schist; the total cost reached 12,000 gold florins, split equally between the French crown and the marquisate. Measuring approximately 2 to 3 meters wide and 2 to 3 meters high (with some sections as low as 1.4 meters), the tunnel accommodated mules laden with cargo, bypassing the steepest sections of the and enabling year-round access despite heavy snowfall. It primarily served the burgeoning trade, channeling commodities from the coastal salines near Arles through the to markets in the , a route vital for regional economies in the late medieval period. Remnants of Renaissance-era mule tracks persist along the approaches to the pass, including paved sections and stone-lined paths that facilitated carrying and other goods; these tracks, widened and maintained in the 15th and 16th centuries, supported an estimated annual traffic of thousands of pack animals. While no dedicated waystations survive at the pass itself, historical records indicate temporary shelters and rest points were established along the broader route to accommodate traders during multi-day journeys. The infrastructure underscored the strategic value of the Col de la Traversette for feudal entities like the , which leveraged the pass to monopolize and tax transalpine commerce amid rivalries with neighboring powers. Following the Marquisate's annexation by the in 1601, the tunnel and associated tracks declined in use, though the pass retained minor trade utility until the . This early engineering feat exemplifies medieval efforts to fortify crossings for economic and defensive purposes.

Historical Significance

Pre-Roman and Ancient Use

Archaeological evidence indicates pastoral activity in the during prehistoric times, with intensified by tribes. Peat profiles at the pass yield bacteria dated to the , confirming increased herding and highlighting the site's intermittent but vital function. The Col de la Traversette integrated into broader proto-Celtic networks across the prior to 500 BC, facilitating exchanges of from northern sources and extracted from briny springs in the northern , essential for and economic value. Ligurian tribes, dominant in the region, likely utilized the pass for these seasonal migrations, combining herding with opportunistic along established routes. Archaeological traces remain limited due to the pass's harsh, high-altitude conditions (elevating to 2947 m), which discouraged permanent settlement. This pattern of use transitioned toward military applications in the .

Medieval Developments

During the , the Col de la Traversette fell under the feudal control of the , which governed the region from the 12th to the and leveraged the pass as a strategic toll point for merchants traversing from in to in . This control allowed the marquisate to regulate and profit from cross-Alpine commerce, positioning the pass as a vital link in regional trade networks. The construction of the Tunnel (Buco di Viso) between 1478 and 1480, commissioned by Marquis Ludovico II del in collaboration with King of , exemplified this oversight; the 75-meter-long pedestrian tunnel, excavated just below the pass's summit at 2,882 meters, was designed to facilitate safer and more reliable passage through the otherwise treacherous terrain. The pass played a central economic role as a key segment of the Via del Sale (), a medieval that transported from Mediterranean ports in northward into Italian territories. , essential for and a valuable commodity, was carried by mule caravans across the , with the tunnel enabling year-round access despite heavy snowfall and avalanches. This route not only boosted the marquisate's revenues through tolls but also challenged the House of Savoy's regional on distribution, fostering economic independence for . The Traversette's strategic importance drew it into broader political conflicts, particularly the wars between and the in the late . During the 1480s and , tensions escalated as sought to expand its influence over the marquisate, leading to military engagements that indirectly affected the pass's . These conflicts highlighted the pass's geopolitical value, as control over it meant dominance in commerce and . Building upon ancient paths that had seen use since pre-Roman times, the medieval developments transformed the Traversette from a seasonal into a fortified economic artery.

Hannibal's Crossing Theory

Historical Context

The Second Punic War (218–201 BC) erupted between and following the Carthaginian siege and capture of the Iberian city of Saguntum in 219 BC, which had placed under its protection, prompting a declaration of war. Hannibal Barca, Carthage's leading general, opted for a bold overland of rather than a naval assault, recognizing 's superior maritime forces and seeking to exploit divisions among 's Italian allies by demonstrating Carthaginian prowess on their doorstep. This strategy aimed to detach 's confederates through a series of decisive land victories, thereby undermining the republic's manpower and logistical advantages without risking a sea battle. In preparation for the campaign, Hannibal assembled a in , drawing from Carthaginian territories in Iberia and , comprising approximately 90,000 , 12,000 , and 37 war elephants before departing New Carthage in late spring 218 BC. The army marched northward through the , facing resistance from local tribes that resulted in significant attrition; by the time Hannibal reached the River, his forces had been reduced to about 50,000 and 9,000 after detachments and battles, with the elephants still intact. Crossing the on improvised rafts, the expedition pressed onward, navigating territories amid further skirmishes with tribes like the . Ancient historians and describe the subsequent Alpine crossing as a grueling 15-day ordeal marked by ambushes from hostile mountain tribes, treacherous narrow paths, and early snowfalls that buried trails and exacerbated supply shortages. These accounts emphasize the expedition's perils, including rockfalls, icy defiles, and attacks that decimated pack animals and troops, culminating in heavy overall losses that dwindled the army to roughly 20,000 and 6,000 upon descending into , with only a handful of elephants surviving. The trek's hardships underscored the strategic gamble, as Hannibal's reduced but battle-hardened force encamped at the ' foothills to recuperate before engaging legions.

Supporting Evidence and Debates

The theory that crossed the via Col de la Traversette has garnered support from scholars who argue it aligns closely with ancient itineraries described in and , tracing a route from the River eastward to the while accounting for reported ambushes and river crossings. In the mid-20th century, British zoologist and museum director Gavin de Beer revived and championed this southern route in his 1955 book Alps and Elephants, based on topographic surveys that matched the pass's steep, craggy terrain and narrow, ruined paths to the historians' depictions of a hazardous ascent plagued by landslides and tribal attacks. De Beer's analysis emphasized the pass's strategic position, allowing a view of the Italian plains upon descent, consistent with 's account of 's army glimpsing their goal after summiting. Opponents of the Traversette hypothesis favor lower passes such as Col du Clapier or , citing the extreme elevation of Traversette—at nearly 3,000 meters—as rendering elephant passage implausible amid and steep gradients. John Hoyte, leading a 1959 expedition that transported an across the via Col du Mont Cenis after planning for Col de Clapier, concluded that the latter's profile better suited a large with pack animals, highlighting logistical challenges like insufficient and water on barren upper slopes such as those at Traversette. Similarly, Stanford archaeologist Patrick Hunt argues for Col du Clapier, asserting that Traversette's narrow defile and high altitude would have caused catastrophic delays and losses, misaligning with the timeline in ancient sources for a 15-day traverse. Central to the scholarly debate are conflicting interpretations of primary texts, particularly Polybius's description of a "barren" devoid of versus Livy's to "vine-covered" lower slopes, which some see as incompatible with Traversette's rocky, alpine character. Proponents like de Beer reconcile these by positing seasonal variations and route specifics, while critics such as classicist F.W. Walbank contend the discrepancies favor northern passes with more verdant approaches. A pivotal modern contribution came in from geomorphologist William Mahaney and colleagues, who analyzed soil samples from a mire near Traversette, identifying compacted layers with horse manure, bacterial traces (Clostridia), and magnetic spherules indicative of ancient campfires, radiocarbon-dated to circa 218 BCE and suggesting passage by a large herd during Hannibal's era. This evidence bolsters the Traversette case but faces skepticism from archaeologists like Andrew Wilson, who question the dating's precision and argue the deposits could reflect prolonged regional activity rather than a singular event. As of , the debate persists with additional geomorphological studies reinforcing the Traversette's alignment with ancient descriptions, though no conclusive archaeological evidence has emerged to settle the question.

Modern Research and Preservation

Archaeological Findings

Archaeological investigations at Col de la Traversette have revealed evidence of ancient animal activity consistent with a large-scale passage through the area. In the , William C. Mahaney and his team conducted analyses at a mire site in the upper Guil Valley, approximately 367 meters below the pass at an of about 2,580 meters on the side. The site, a waterlogged measuring roughly 60 by 40 meters, yielded a bioturbated layer (known as the mass animal deposition or MAD bed) at depths of 35–50 cm, characterized by high levels of fecal biomarkers such as 5β-stigmastanol and , indicating substantial mammalian dung accumulation. Radiocarbon dating of organic material from this layer, calibrated using OxCal v.4.2.4, places the deposition event at approximately 2,168 calibrated years , corresponding to around 218 BC. The layer also contained elevated concentrations of bacteria, which comprise over 70% of microbes in horse dung and persist in for millennia, alongside a spike in pollen suggestive of grazing by large herbivores. These indicators point to a temporary rest or area used by numerous animals, with no direct remains of identified but proxy evidence from the fecal signatures implying the presence of sizable mammals, potentially including horses and pack animals. Findings such as these, concentrated on the French approach, underscore the site's role as a potential during ancient transits, including possible links to Hannibal's campaign.

Contemporary Studies

In the , interdisciplinary research at Col de la Traversette utilized advanced geoarchaeological techniques to examine potential evidence of ancient military passages. Geochemical analyses of alluvial mire sediments revealed elevated concentrations of organic carbon, , and ethylcoprostanol—biomarkers associated with faecal matter—dated via radiocarbon to approximately 218 BC, aligning with the timeline of Hannibal's invasion. These findings, combined with stratigraphic disruptions indicating mass animal deposition, suggest the passage of a large Carthaginian force through the area. Microbiological investigations complemented these efforts, employing to identify high abundances of 16S rRNA genes in layers, indicative of substantial mammalian dung accumulation from herbivores and humans around 2000 years ago. Such microbial profiling helped trace the ecological impact of historical animal traffic, distinguishing it from local through comparative genetic markers. Physical surveys and aerial imagery further aided in reconstructing probable ancient paths across the pass, highlighting geomorphological features like rockfalls and terraces consistent with historical accounts. Preservation efforts since the 2010s have involved cross-border collaborations between French and Italian authorities, including the Parc Naturel Régional du Queyras and the adjacent Piemonte regional parks, to regulate hiker access and mitigate trail erosion. These initiatives emphasize non-invasive monitoring to safeguard the site's fragile high-altitude ecosystems while promoting its . Ongoing challenges include the impacts of , which is accelerating thaw across the and potentially exposing or destabilizing buried artifacts at elevations like Col de la Traversette's 2,947 meters. Ethical concerns also persist regarding invasive sampling methods, such as sediment coring and , with debates centering on the balance between advancing knowledge and preserving irreplaceable heritage materials. Scholarly debates on the route continue into the , with recent reviews examining the interdisciplinary evidence without definitive resolution.

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