Geology & Natural History
Devils Tower, a basalt column rising 1,267 feet above the nearby Belle Fourche River, was the nation’s first National Monument and remains important to tourists and the many tribes that hold it sacred.
The basin of the North Platte River takes up the southeastern quarter of Wyoming, plus a finger of land along the tributary Sweetwater River in the center of the state. The courses of the North Platte and Sweetwater determined early fur-trade and emigrant routes. Since that time, the basin’s water and other resources have continued to draw industry, stock raising, dams and irrigation—and people.