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Great Plains

broad expanse of flat land west of the Mississippi River and east of the Rocky Mountains in the United States and Canada. It is a old plain. Iridoclitis
Map of the Great Plains with a red line showing the 100th meridian

The Great Plains is a large space of level land or prairie in the middle and western parts of North America. The western boundary is the Rocky Mountains. In the east, the Great Plains end where there is enough rain to support many trees. Summers are hot and humid, winters are cold. Bison formerly numbered millions and were the main food for people there. Now the area’s cereal crops feed cattle and people.

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