Indios de las llanuras es Plains Indian en

Indian peoples who inhabit, or formerly inhabited, the North American Great Plains, which is 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 States. The area is drained principally by the Missouri and Mississippi rivers; the valleys of this watershed are the most reliable sites from which to obtain fresh water, wood, and most plant foods.