One of the world's largest alpine lakes, 132-square-mi Yellowstone Lake was formed when the glaciers that once covered the region melted into a caldera—a crater formed by a volcano. The lake has 141 mi of shoreline, along which you will often see moose, elk, waterfowl, and other wildlife. In winter you can sometimes see otters and coyotes stepping gingerly onto the ice at the lake's edge. Many visitors head here for the excellent fishing—streams flowing into the lake give it an abundant supply of trout.
Intersection of East Entrance Rd. and Grand Loop Rd., between Fishing Bridge and Grant Village, Yellowstone National Park, Wyoming, United States