The Quebrada de Chaile, the Quebrada de Soncor and the Quebrada de Talabre canyons run towards Salar de Atacama; they are deep and wide. These valleys were probably formed by erosion during glacial periods. The valleys drain the western, northern and southwestern slopes of Lascar. The southeastern slopes drain into Laguna Lejía which is close to the volcano, and the northwestern slope drains through the Quebrada de Morro Blanco.