WYOMING (corrupted from North Ameri can Indian Haughtrauwama, large plains). A Western State of the United States, situated within the Rocky Mountain region between lati tudes 41° and 45° N., longitudes 104° 3' and 111° 3' W. It is Kounded on the north by Mon tana, on the east by South Dakota and Nebraska, on the south by Colorado and Utah, and on the west by Utah and Idaho. Wyoming is rectangu lar in shape, measuring 355 miles from east to west and 270 miles from north to south. Its boundaries arc straight lines running along meridians and parallels of latitude. The area of the State is 97,990 square miles, making it the sixth in size among the States.
Tommixray. The whole State is a lofty plateau including almost the entire breadth of the Rocky Mountain system. and the Continental Divide crosses it from the northwestern corner to the middle of the southern boundary. The pla teau consists of a emnparatively level floor lying from 5000 to 7000 feet above the sea, and trav ersed by a number of more or less detached mountain ranges, which divide the vast plains into a number of separate- basins. The ranges rise from 3000 to 4000 feet above the surround ing country, their general elevation being 10,000 to 11,000 feet. In the southeastern part of the State the Laramie Plains are inclosed by the Laramie range on the northeast, the Rattlesnake and Seminole ranges on the northwest, and the detached groups of the Snowy and Medicine Bow ranges on the southwest. North and east of the Laramie range the vast plains of the Platte and Cheyenne basins stretch for 150 miles in either direction. They are bounded on the northeast by the Black Hills, which extend across the State boundary from South Dakota. In the south western quarter of the State there is another ex tensive plain-basin known as the Red Desert, but the northwestern quarter is a region of lofty mountains, having only one basin of considerable size, that of the Big Horn. This is bounded on the east by the magnificent Big Horn Mountains, which extend 100 miles south ward from the middle of the northern boundary,. and form one of the longest and most continuous ranges in the State. Southwest of the Big Horn Basin are the Shoshone and Owl Creek Moun tains, which are separated by the narrow Wind River Valley from the massive and snow-clad Wind River range, extending southeastward toward the Red Desert. This range is the loftiest
in the State; it has several peaks over 13,000 feet high, and Fremont Peak, the highest point, has an altitude of 13,790 feet. The Gros Ventre, a spur of the Wind River range. runs westward to the canon of the Snake beyond which, just inside the western State boundary, the Teton range rises in the Grand Teton to a height of 13,071 feet. The extreme northwestern part of the State is a rugged complex of lofty moun tains and plateaus cut by numerous canons, and this region has been set apart as a Federal reser vation 'known as the Yellowstone National Park (q.v.).
Hydrographically Wyoming is divided among three of the greatest drainage systems of the country, those of the Columbia and the Colorado rivers on the Pacific slope, and that of the Mis souri on the Atlantic slope. The last occupies by far the largest area. The River flows through the Yellowstone Park. and with its two largest tributaries, the Big Horn and the Powder rivers, drains most of the northern half of the State. The other tributaries of the Mis souri, draining the eastern and south central portions, are the Little Missouri and the Chey enne in the northeast and the North Platte in the southeast. The latter enters the State from Colorado, and makes a great, almost circular, bend around the Laramie Mountains. Its larg est afiluents within the State are the Sweetwater from the west and the Laramie from the south. The southwestern part of Wyoming is drained by the Green River, the main headstream of the Colorado. It rises on the Wind River ranee, and flows southward into Utah, Shoglione Lake in Yellowstone Park gives rise to the Snake River. the largest tributary of the Columbia. It flows southward for nearly 100 miles, and then. in a grand cation, breaks through the gap be tween the Teton and Salt Rive• ranges. passing into Idaho. The largest lakes in the State are Yellowstone Lake, in the Yellowstone Park, and Jackson Lake, traversed by the Snake River, sonic- distance south of the park.