Established in 1872, Yellowstone National Park is America's first national park.
Yellowstone National Park covers 2,221,766 acres, which is roughly the size of the state of Connecticut.
Most of the park is located in the northwestern corner of Wyoming, but a small portion overlaps that state's boundaries with Montana and Idaho.
The park is comprised primarily of high, forested, volcanic plateaus that have been eroded over - the millennia by glaciation and stream flow and that are flanked on the north, east, and south by mountains.
The Continental Divide traverses the park from its southeastern corner to its western boundary.
The elevation of the park averages 8,000 feet, ranging from 5,282 feet in the north, where the Gardner River drains from the park, to 11,358 feet in the east, at the summit of Eagle Peak in the Absaroka Range.
Yellowstone Lake is one of the largest high-altitude lakes in North America and is centered over the Yellowstone Caldera, the largest supervolcano on the continent.
The caldera is considered an active volcano; it has erupted with tremendous force several times in the last two million years.
Half of the world's geothermal features are in Yellowstone.

YNP is home to a large variety of wildlife including grizzly bears, black bears, wolves, coyotes, bison, pronghorn, swans, eagles, deer, and elk.
Preserved within YNP are Old Faithful and a collection of the world's most extraordinary geysers and hot springs, and the Grand Canyon of the Yellowstone.