Lake, Yellowstone National Park, northwestern Wyoming, U.S. It lies at 7,731 ft (2,356 m) above sea level, the largest body of water in North America at so high an altitude. It is fed and drained by the Yellowstone River. About 20 mi (32 km) long and 14 mi (23 km) wide, it has a maximum depth of 390 ft (119 m) and a surface area of 137 sq mi (354 sq km). It is a haven for rare species of waterbirds, including trumpeter swans, and is prized for trout fishing
a large national park mostly in Wyoming, in the northwestern US, famous for its hot springs and geysers (=natural springs of hot water that rise suddenly into the air) , especially one called Old Faithful which many tourists come to see. National preserve in northwestern Wyoming, southern Montana, and eastern Idaho, U.S. The oldest national park in the U.S. (and in the world), it was established by the U.S. Congress in 1872; it covers 3,468 sq mi (8,983 sq km). The Gallatin Range, Absaroka Range, Snow Mountains, and Teton Range extend into it. Yellowstone has unusual geologic features, including fossil forests and eroded basaltic lava flows. It also has 10,000 hot springs, which erupt as steam vents, fumaroles, and geysers. Old Faithful, the park's most famous geyser, erupts every 33 to 93 minutes. It has many lakes and rivers, including Yellowstone Lake, Shoshone Lake, the Snake River, and the Yellowstone River. In 1988 an extensive series of forest fires laid waste to large areas of the park
River, northwestern Wyoming and southern and eastern Montana, U.S. The river rises in Wyoming. It enters Yellowstone National Park and feeds into Yellowstone Lake, below which it plunges 422 feet (129 m) in two spectacular waterfalls and enters the Grand Canyon of the Yellowstone River. It then continues north into Montana. There it flows northeast into the Missouri River on the Montana-North Dakota boundary. It is 692 mi (1,114 km) long and has been developed extensively for irrigation. Its principal tributaries are the Bighorn, Tongue, and Powder rivers. It was first explored in 1806 during the Lewis and Clark Expedition
the first national park in the United States; located in the border area between Wyoming and Montana and Idaho; spectacular wilderness; famous for Old Faithful geyser and for buffalo and bears