Plains Indian, member of any of the Native American peoples inhabiting the Great Plains of the United States and Canada. This culture area comprises a vast grassland between the Mississippi River and the Rocky Mountains and from present-day provinces of Alberta and Saskatchewan in Canada through the present-day state of Texas in the United …
Great Plains, also called Great American Desert, major physiographic province of North America. The Great Plains lie between the Rio Grande in the south and the delta of the Mackenzie River at the Arctic Ocean in the north and between the Interior Lowland and the Canadian Shield on the east and the Rocky Mountains on the west.