What are broad, elevated regions on land or under the ocean called?

The term "plateaus" refers to broad, elevated regions on land or under the ocean. These geographic features are characterized by their flat terrain that stands significantly higher than the surrounding area. Plateaus can form through various geological processes, such as volcanic activity or the uplifting of sedimentary rock layers. Their expansive and relatively level surface sets them apart from other landforms like mountains, which are typically more rugged and steep, and valleys, which are low-lying areas between hills or mountains. Hills, while elevated, do not achieve the extensive flat area typically associated with plateaus. Understanding this distinction helps in grasping the varied topographical features associated with geology and plate tectonics.