Barranco de Los Arcos was carved by centuries of volcanic runoff channeling through basalt fissures on Tenerife's northern slope, creating a 200-metre descent corridor studded with natural chutes, limestone arches, and pools that hold snowmelt from Teide's upper reaches well into spring. The canyon remained largely inaccessible until the 1990s, when local climbing clubs established fixed anchor points and graded the route's six rappel stages, transforming a technical scramble into one of the Canary Islands' most repeatable canyoning circuits. Today it anchors La Orotava's adventure-tourism corridor, drawing intermediate-level climbers and first-time canyoneers in equal measure. The geology tells two stories. The upper canyon walls are columnar basalt—hexagonal pillars formed when lava cooled against the ridge's paleo-surface roughly 800,000 years ago. The lower third transitions to friable tuff, layered ash deposits that erode more readily, widening the gorge and creating the terraced pools that punctuate the descent. Winter storms reshape the lower canyon annually, shifting boulder fields and scouring out new plunge basins; by summer the water runs clear and shallow, ideal for descent windows between late May and early October. Los Arcos' namesake arches—three limestone spans deposited during a Miocene marine transgression—frame the final abseil, a 35-metre free-hang into a kidney-shaped pool that holds 4°C water even in August. Canyoning tour Tenerife operators converge on this site for practical reasons: the trailhead sits 400 metres above La Orotava's town center, reachable via a paved forestry track that terminates at a concrete apron used for gear checks and harness fitting. The canyon's six stages are spaced at 20- to 40-metre intervals, allowing guides to maintain visual contact with groups and establish belay positions before clients commit to each drop. Most descents clock in at three to four hours, including a 45-minute approach hike through Canary pine stands and a downstream exit that rejoins the access road 1.2 kilometres below the put-in. The route requires no prior climbing experience—guides rig all anchor systems and provide Petzl harnesses, helmets, and gloves—but does demand comfort with exposure and cold-water immersion. The canyon's popularity has prompted permitting protocols. As of 2026, La Orotava's municipal council caps daily descents at 60 participants, distributed across eight licensed operators who book morning slots between 09:30 and 11:00. The quota system has stabilized wear on fixed anchors and reduced congestion at the two narrow chimney sections where only single-file passage is feasible. Environmental monitors track erosion at the three main pool exits, where repeated boot traffic has begun to destabilize tuff layers; steel steps were installed in 2023 to formalize the lower traverse and redirect impact away from the most fragile strata.