Isle Royale National Park is a U.S. National Park in the state of Michigan. Isle Royale, the largest island in Lake Superior, is over 45 miles (72 km) in length and 9 miles (14 km) wide at its widest point. The park is made up of Isle Royale itself and approximately 400 smaller islands, along with any submerged lands within 4.5 miles (7.24 km) of the surrounding islands. Isle Royale National Park was established on April 3, 1940, was designated as a Wilderness Area in 1976, and was made an International Biosphere Reserve in 1980. It is a relatively small national park at 894 square miles (2,320 km2), with only 209 square miles (540 km2) above water. At the U.S.-Canada boarder, it will meet the borders of the future Canadian Lake Superior National Marine Conservation Area. The park has two developed areas: Windigo, at the southwest end of the island (docking site for the ferries from Minnesota), with a campstore, showers, campsites, and a boat dock; and Rock Harbor on the south side of the northeast end (docking site for the ferries from Michigan), with a campstore, showers, restaurant, lodge, campsites, and a boat dock. The Tobin Harbor Trail at sunsetSleeping accommodations at the park are limited to the lodge at Rock Harbor and 36 designated wilderness campgrounds. Some campgrounds are accessible only by private boat; others in the interior are accessible only by trail or by canoe/kayak on the island lakes. The campsites vary in capacity but typically include a few three-sided wood shelters (the fourth wall is screened) with floors and roofs, and several individual sites suitable for pitching a small tent. Some tent sites with space for groups of up to 10 are available, and are used for overflow if all the individual sites are filled. The only amenities at the campgrounds are pit toilets, picnic tables, and fire-rings at specific areas. Campfires are not permitted at most campgrounds; gas or alcohol camp stoves are recommended. Drinking and cooking water must be drawn from local water sources (Lake Superior and inland lakes) and filtered, treated, or boiled to avoid parasites. Hunting is not permitted, but fishing is, and edible berries (blueberries, thimbleberries) may be picked from the trail. The Greenstone Ridge is a high ridge in the center of the island and carries the longest trail in the park, the Greenstone Ridge Trail, which runs 40 miles (60 km) from one end of the island to the other. This is generally done as a 4 or 5 day hike. A boat shuttle can carry hikers back to their starting port. In total there are 165 miles (265 km) of hiking trails. There are also canoe/kayak routes, many involving portages, along coastal bays and inland lakes.