A plain is a large area of flat or slightly undulating, low-lying land. Some plains, such as a peneplain, result from the wearing away of higher terrain. Most plains result from deposition of sediments, as by rivers and lakes, which leave flat plains when the water dries up. Flood plains are formed in river valleys. Glacial plains are large, level areas of till, which is left by retreating glaciers.
Related category GEOGRAPHY
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