Anou Boussouil (in English "Great Chasm") is a limestone karst cave located in the mountains of Djurdjura, Algeria.[1] The cave is 3,200 metres (10,500 ft) long and 805 metres (2,641 ft) deep.[2] The entrance to the cave is 1,074 metres (3,524 ft) up the mountainside.[3] During the springtime rainy season, melting snow pours through a channel leading directly to the cave mouth, continuing the process of erosion.[3] This distinguishes it from other caves in the Djurdjura range, which are inactive and no longer being enlarged through erosion.[4]