👉 The term "souterrain" is typically used in the context of geology and geomorphology, referring to a type of underground or buried space that lies beneath the surface of the Earth. It is characterized by its depth being greater than approximately 20 kilometers (13,100 feet) below the surface. This term is often used to describe the areas where water can flow underground due to geological processes such as erosion and sedimentation. Souterrain can be found
