👉 Peneplains are a type of subterranean river that drain into the ocean. They were once major rivers in Europe, but their importance has declined over time due to the erosion and sedimentation caused by human activities. Peneplains can be found in many parts of the world, including Asia, Africa, and Australia, and they play a significant role in shaping the landscape. Peneplains are characterized by steep cliffs and rocky outcrops that form a series of narrow channels
