Rock Harbor is the main access point for visitors landing on Isle Royale in northern Lake Superior. It sits four miles (6.4 km) from the northeastern end of the 45-mile-long (72 km) island, the whole of which is protected as Isle Royale National Park. Two structures in Rock Harbor—the Rock Harbor Light and the Edisen Fishery—are listed on the National Register of Historic Places. The ferry boats land at Snug Harbor, which also has berths for private watercraft, a campground, the visitor center, and a lodge that predates the national park.