👉 Submontagne is a geological term that describes the lower part of an Earth's volcanic mountain range, usually defined as between 50 and 100 kilometers (32 and 64 miles) below the surface. This area is typically characterized by flat terrain, rough surfaces, and often covered with snow or ice. It is also known for its lack of significant topography and can be found in many parts of the world, including Europe, North America, Africa, Asia, and