Wyo'ming, a NW. state of the American Union, lies mainly on the E. slope of the Rocky Mountains, and is bounded by Montana, South Dakota, Nebraska, Colorado, Utah, Idaho, and Montana. The length, E. to W., is 360 miles, and the width is 275 miles; area, 97,890 sq. m. The state is traversed by the main axis of the Rocky Mountains, with Fremont's Peak (13,790 feet) and Mount Hayden (13,091). The Yellowstone (q.v.) National Park is mainly within its limits. Interspersed between the ranges are broad plateaus with arable soils, which with proper irrigation yield prolific crops; but less than one-sixth of the state is capable of cultivation; Wyoming is essentially a grazing country. The mean elevation of the plateau regions is from 7000 to 8000 feet. Yellowstone Lake has an altitude of 7778, Lewis Lake 7750, and Shoshone Lake 7670 feet above the sea. The state drains directly to the Pacific, to the Missouri, to the Columbia, and to the Colorado. In the mountain regions are deposits of gold and silver and ores of copper and iron. Coal is worked; and there are supplies of soda, some tin, abundance of limestone, and oil-wells. The climate is dry, although the country is well watered by streams. The summers are mild and delightful, but in exposed regions the winters are severe. The chief towns are Cheyenne, the capital, Laramie, Rock Springs, Rawlins, and Evanston. Wyoming comprises portions of the territories acquired by the Louisiana Purchase of 1803, and by the treaty with Mexico in 1848. It was organised as a territory in 1868, and admitted a state in 1890. Pop. (1870) 9118; (1880) 20,789; (1900) 92,531.