Alarge , flat area that rises above surrounding land

 PLATEAU

A plateau is a broad flat area of land that rises above the surrounding land. The word stems from the French language, from a word root meaning "flat."  The largest and highest plateau in the world is the Tibetan Plateau, which is about 3 miles above sea level, and extends over 600 miles north/south and about 1600 miles east/west.  Around the Tibetan Plateau are large mountain ranges that include the world's tallest peak, Mount Everest.

Sidenote:  I lived for many years in West Texas, in the region known as the Llano Estacado, or "Staked Plains."  It is an expansive plateau or mesa region with an elevation between 3000 and 5000 feet.

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