The Tolls de l'Algars are situated precisely on the provincial border separating the municipalities of Arnes in Tarragona and Lledó in Teruel.
The limestone bedrock has been eroded over millennia to create a series of interconnected 'tolls' or natural deep pools.
The water remains significantly cool throughout the year due to the shade provided by the narrow canyon walls and underground springs.
The Algars River basin serves as a natural corridor for local wildlife, including various species of dragonflies and river-dwelling fish.
The geological composition is primarily Jurassic limestone, which accounts for the high clarity of the water.
Toll Blau is a prominent natural swimming hole located along the Algars River near the border of Catalonia and Aragon. The site features a deep, clear pool carved into limestone rock, fed by the river's flow through a narrow canyon. It is part of a series of natural basins known collectively as the Tolls de l'Algars. The surrounding landscape is characterized by Mediterranean riverbank vegetation and rugged, uneven terrain. Visitors typically use the pool for cold-water swimming during the summer months when the water level is stable. The area remains unmanaged, lacking formal amenities or lifeguard services.
From the elevated rock ledge overlooking the main basin to capture the contrast between the turquoise water and the pale limestone canyon.
Bring sturdy, non-slip water shoes to navigate the submerged, uneven limestone rocks.
Pack all trash out, as there are no waste disposal facilities at this remote natural site.
Arrive early in the day to secure space, as the pool becomes crowded with local visitors on summer weekends.
Do not attempt to dive from the surrounding cliff tops, as the water depth varies significantly and underwater rock formations are common.
Water levels can drop significantly during late summer droughts; check local environmental reports before visiting.
Respect the natural silence; do not play loud music. Leave no trace of your presence.
