The bridge is built atop a massive flow of basaltic lava that originated from the nearby Gravenne de Thueyts volcano.
The gorge below is known as the 'Gueule d'Enfer' due to the intense, swirling water currents that historically trapped driftwood and debris.
The bridge is situated at the narrowest point of the river where the basalt rock walls reach their highest vertical density.
It is part of a wider regional network of trails that explore the 'Chaussée des Géants' (Giant's Causeway), a set of volcanic basalt columns.
The site acts as the entry point for one of the most technical Via Ferrata routes in the Ardèche department.
The Pont du Diable in Thueyts is a medieval stone bridge spanning a narrow gorge carved by the Ardèche River. It serves as a gateway to the volcanic landscape of the Monts d'Ardèche Regional Natural Park. The structure is built over the 'Gueule d'Enfer' (Mouth of Hell), a deep basalt canyon characterized by organ pipe geological formations. Visitors can access the riverbanks for swimming during warmer months. The site is a primary starting point for the Via Ferrata du Pont du Diable, which utilizes the basalt cliffs. A marked trail system connects the bridge to the surrounding volcanic sites and local lava flows. The bridge is constructed entirely from local stones, integrated directly into the natural basalt columns of the riverbed.
The riverbank directly beneath the bridge offers the best upward angle to capture the stone arch against the basalt canyon walls.
Wear sturdy, closed-toe footwear if you plan to navigate the rocky riverbanks or hike the nearby basalt trails.
The descent to the river involves steep paths; ensure you have appropriate gear if you intend to swim.
Combine the bridge visit with the short hike to the Echelle du Roi viewpoint for a perspective from above the canyon.
Attempting the Via Ferrata without proper climbing harness equipment or the required technical knowledge.
The site is accessible year-round, though access to the riverbed may be restricted during periods of heavy rain or high water levels.
Respect the natural site by carrying out all trash; swimming is at your own risk as there are no lifeguards.
