The concept map explains the Plains of Europe. A plain or lowland is a flat area that does not exceed 300 meters above sea level. If the altitude is at least 300 m, it is called a plateau, while land below sea level is called a depression. European plains are classified by origin and geographical zone. Their origin can be erosional (rain, wind, and glaciers erode mountains) or alluvial (rivers and glaciers deposit sediments). The plains are divided into three zones: north-eastern, central, and southern. Examples include the Sarmatian Lowland (the largest), Jutland, the London Plain, and Svealand in the north-east; the German, French, Hungarian, and Dutch plains in the center; and the Po Valley, Ebro Plain, Wallachia, and Andalusian Plain in the south.