Which Great Lake contains Isle Royale, a U.S. national park?

Lake Superior contains Isle Royale, which is protected as Isle Royale National Park.

Isle Royale is a large island in northwestern Lake Superior, near the Canadian border. The United States established the national park in 1940, and it became part of the National Wilderness Preservation System in 1976. The park includes the main island, many smaller islands, and surrounding waters.

The island is especially known for its isolated populations of gray wolves and moose. Researchers have studied their predator–prey relationship for decades, making Isle Royale one of the world’s best-known long-term wildlife research sites.

Visitors reach the park by ferry, private boat, or seaplane because there are no roads connecting it to the mainland. Winter conditions are severe, and the park is generally closed to visitors during the coldest months. Isle Royale is part of Lake Superior, not Lake Michigan, despite its location in the upper Great Lakes region.