A plain is a geographical landform characterized as a flat expanse of land with few rapid or steep changes in elevation. These features occur as lowlands along valleys, at the base of mountains, as coastal plains, or as plateaus and uplands. Plains are among the major landforms on Earth, covering more than one-third of the world's total land area across all continents.
The natural vegetation found in plains varies significantly depending on the region and biome, including grasslands, prairies, forests, savannas, tundra, and deserts. Due to their relatively level terrain, plains are frequently utilized as important areas for agriculture.