Landsat view of the island.
|Area||184 km2 (71 sq mi)|
|District||Thunder Bay District|
Michipicoten Island is an island in Ontario, Canada, in the northeastern part of Lake Superior, about 175 kilometres (109 mi) northwest of Sault Ste. Marie and 65 kilometres (40 mi) southwest of Wawa, Ontario. At its closest point to mainland Ontario, the island is located about 16 kilometres (9.9 mi) from the mainland. It falls within the boundaries of Thunder Bay District. The third largest island in Lake Superior, Michipicoten Island is 27 kilometres (17 mi) long and 10 kilometres (6.2 mi) wide at its widest point.
Most of the lands of Michipicoten Island, as well as smaller islands, shoals, and waters which surround it to within 2,500 m, were regulated as Michipicoten Island Provincial Park in 1985.  Despite attempts to develop a comprehensive park management plan in the early- to mid-2000s, it continues to be administered by Ontario Parks under an interim management statement developed in 1986.
During the spring, summer, and fall, the island is inhabited or regularly visited by the owners of camps located on a small number of private inholdings, commercial fishers, and clients of a commercial outpost camp. It has become a destination for some adventurous kayakers. In the winter, due mainly to reasons of remoteness and difficulty of access, the island is usually uninhabited.
A lighthouse was established in 1912 on the eastern end of the island. It was staffed until 1988.
On some old maps, Michipicoten Island is shown as Isle Maurepas, after the French minister of Marine Jean-Frédéric Phélypeaux, Count of Maurepas. The word Michipicoten is an Anglicization of the original Ojibwe word Mishipikwadina, meaning "big bluffs" in Ojibwe, and is a reference to the geography of the nearby Michipicoten River.
Mishipeshu, a powerful creature in the mythological beliefs of some Native American tribes―particularly Anishinaabe tribes, the Odawa, Ojibwe, and Potawatomi, of the Great Lakes region of Canada and the United States―is traditionally said to make his home on Michipicoten Island.
Michipicoten Island played host to an indigenous caribou population until the herd's extirpation, as a result of overhunting, in the mid-1800s. In 1981, a lone male caribou was observed on the island; how it arrived there remains unknown. In 1982, additional caribou - one male, three adult females and three female calves - were moved to the island from the Slate Islands by the Ministry of Natural Resources. An additional male was translocated in 1989. From the time of these relocations to 2001, the herd population increased at to arrive at approximately 160 animals in 2001. A population determination performed in 2011 concluded that the herd had grown to 680 animals. At times, the rate of population growth was among the fastest ever recorded for caribou.
In the winter of 2014, four wolves transited to Michipicoten Island. This was facilitated by an ice bridge which had formed between the island and the mainland. The wolf population had more than tripled by the winter of 2016/2017. The 2017/2018 wolf population count is anticipated to reveal approximately 20 wolves present on the island. The decline in the caribou population as resulting from the presence of the wolves has raised the concern that the caribou population is in danger of extirpation as soon as the winter of 2017/2018.
The caribou population of Michipicoten Island is scientifically significant because it manifests an opportunity to apply A. T. Bergerud's proposed test to assess the viability of the range hypothesis versus the predation hypothesis for providing a credible explanation for caribou population decline. Adapted to Michipicoten Island, Bergerud's proposed test was two-part: First, the caribou population on Michipicoten Island should increase despite the lack of lichen in the island's Great Lakes/St. Lawrence Forest. This happened, and it indicated that lichen was not a critical requirement in the diet of caribou. Second, after the appearance of wolves, the population of caribou should decline. Should these population trends emerge, it would indicate conclusively that wolf predation, and not a lack of lichen as forwarded by the range hypothesis, was a key factor in the decline of caribou throughout North America.
The caribou population of Michipicoten Island is ecologically significant because it and the Slate Islands caribou population are all that conclusively and verifiably remain of a caribou population which was once found throughout the federally-recognized ON6 Lake Superior caribou range. Ontario Ministry of Natural Resources and Forestry/Parks Canada 2016 caribou populations surveys failed to conclusively observe any caribou remaining in the lands along the north shore of Lake Superior.
- Ontario Ministry of Natural Resources (2004). Michipicoten Post and Michipicoten Island Provincial Parks Management Planning: Background Information (PDF). Queen's Printer for Ontario. ISBN 0-7794-6544-X. Retrieved April 18, 2014.
- Ontario Ministry of Natural Resources (July 2, 2013). "Natural Heritage Information Centre". Queen's Printer for Ontario. Retrieved April 18, 2014.[permanent dead link]
- Schwartz, Seymour I. (2008). The Mismapping of America. Rochester, NY: University of Rochester Press. pp. 192–195. ISBN 9781580461290.
- Kelton, Dwight H. (1889). Indian Names and History of the Sault Ste Marie Canal. Detroit: Detroit Free Press Printing Co. pp. 24–5.
- Conway, Thor (2010). Spirits in Stone. Sault Ste. Marie, Ontario: Heritage Discoveries.
- Kohl, Johann (1859). Kitchi-Gami: Life Among the Lake Superior Ojibway. ISBN 0-87351-172-7.
- Bergerud, Arthur T.; Dalton, W. J.; Butler, H.; Camps, L.; Ferguson, R. "Woodland caribou persistence and extirpation in relic populations on Lake Superior". doi:10.7557/126.96.36.1991. Missing or empty
- Bergerud, Arthur T. (October 1974). "Decline of Caribou in North America Following Settlement". The Journal of Wildlife Management. 38 (4): 757–770. doi:10.2307/3800042.
- Shuter, Jennifer; Asselin, Natalie; Rodgers, Art (November 17, 2016). Results of the 2016 Lake Superior Coast Range (LSCR) caribou (Rangifer tarandus caribou) aerial survey. Ontario Ministry of Natural Resources and Forestry/Parks Canada. p. 2.
- Ontario government documents regarding Michipicoten Island
- Description of a commercial kayaking trip to Michipicoten Island, with information about the island
- 1910 Log Book of the North Shore Club: Michipicoten / Wawa Region History
-  Story of two sea kayakers rescued by the Coast Guard off Michipicoten Island