plain

Land, usually flat, upon which grass predominates. The plains cover large areas of the Earth's surface, especially between the deserts of the tropics and the rainforests of the Equator, and have rain in one season only. In such regions the climate belts move north and south during the year, bringing rainforest conditions at one time and desert conditions at another. Temperate plains include the North European Plain, the High Plains of the USA and Canada, and the Russian Plain (also known as the steppe).