The term for an area of flat land elevated significantly above sea level is called a plateau. Plateaus are characterized by their relatively flat terrain and can be formed through various geological processes, including volcanic activity or erosion. They can be found worldwide, often surrounded by mountains or hills. One of the most notable plateaus is the Tibetan Plateau, which is the highest and largest plateau globally, often referred to as "the Roof of the World." Plateaus are essential for agriculture and biodiversity, providing unique ecosystems.