Heart Lake is a remote backcountry destination in Yellowstone National Park's Teton County, Wyoming portion, located approximately 7 miles from the trailhead along the South Entrance Road. At 7,641 feet elevation, this wilderness lake sits at the foot of Mount Sheridan and is one of the largest backcountry lakes in the lower 48 states accessible only by trail. The lake is accessed via a 7-mile hike through lodgepole forests and meadows following Witch Creek, which is noted for its warm waters offering occasional soaking opportunities. Hand-propelled vessels (canoes, kayaks) are permitted, though paddlers must carry or pack their boats in. The lake is not accessible by road, ensuring a primitive wilderness experience.

Heart Lake is surrounded by the Heart Lake Geyser Basin, which includes Rustic Geyser and various thermal features along the shoreline. These geothermal areas create unique vistas with hot springs visible along the banks. The remote location within Yellowstone's bear country requires proper food storage and bear safety awareness. Backcountry camping permits are required, with designated campsites available along the lake shore.

The fishery supports native Yellowstone cutthroat trout and offers excellent angling opportunities, particularly appealing to backcountry anglers. Wildlife viewing includes moose, which are relatively common in the area, and the lake provides opportunities to observe loons, a rare sighting in Yellowstone.

The primitive character of Heart Lake means no facilities exist at the lake itself—paddlers must be completely self-sufficient. The area experiences seasonal closures (typically April 1 to June 30) for bear management. This is a serious wilderness paddling destination requiring backcountry experience, proper planning, and physical fitness for the approach hike.