The ravines were formed by the combined action of river erosion and rainwater runoff over geological epochs.
The sediment layers visible in the cliffs contain fossils of animals that inhabited the region during the Miocene period.
The site acts as a critical nesting ground for the eagle-owl and the peregrine falcon.
The reddish hue of the landscape is caused by high concentrations of iron oxide in the clay soil.
The reservoir at the base of the cliffs was created by the construction of the Castrejón dam, which regulates the flow of the Tagus River.
Barrancas de Castrejón y Calaña is a protected natural site in the province of Toledo featuring dramatic clay ravines carved by the Tagus River. The landscape consists of steep gullies and reddish-colored cliffs created by millions of years of erosion. It spans a significant portion of the Embalse de Castrejón, a reservoir that contrasts with the arid cliff faces. The area is a designated Special Protection Area for birds (SPA) due to the presence of raptors and other cliff-nesting species. A well-marked trail system allows visitors to walk along the upper ridge of the cliffs. The terrain is composed primarily of sedimentary materials, including clays, sands, and conglomerates. The environment is highly sensitive to erosion, necessitating strict adherence to marked paths. The site offers expansive views of the surrounding Castilian plains and the river basin below.
The Senda del Pico del Cambrón viewpoint, which offers the most expansive vista over the entire ravine system and the river.
Wear sturdy hiking boots as the paths are composed of loose, uneven sediment and dust.
Bring your own water and supplies, as there are no facilities or vendors located within the natural area.
Apply high-factor sunscreen, as the ridge offers almost no natural shade.
Do not attempt to descend the steep, unstable cliff faces to reach the water level, as the terrain is prone to landslides.
Stay strictly on the marked paths to prevent soil erosion and disturbance to local bird nesting sites; pack out all trash.
