Potagannissing Bay is a shallow, island-strewn bay on Lake Huron in Algoma District, Ontario, Canada and Chippewa County, Michigan, United States. It is bounded by the land masses of St. Joseph Island, Ontario at the northwest and Drummond Island, Michigan at the southeast, and by the water bodies the Saint Marys River and the De Tour Passage at the southwest and the North Channel at the northeast. The bay is northeast of De Tour Village, Chippewa County. The bay's waters are rich in freshwater fish.
Potagannissing Bay occupies the site of the rapid melting of a glacier at the end of the Wisconsin glaciation approximately 10,000 years before the present. The melting ice dumped random piles of rock and gravel onto a section of land surface so low-lying that most of it wound up under the surface of the Great Lakes. The bay is currently studded with 53 named islands and innumerable unnamed ones. Few of the islands are permanently inhabited, but many are privately owned with summer cottages built upon them for the use of their owners.
The bay's largest industries are sport and charter fishing for trophy fish such as bass, northern pike, and salmon; commercial fishing for fish such as lake trout and walleye; and pleasure boating. The innumerable islands of the bay create opportunities for amateur exploring and sightseeing, and a sheltered coastline is rarely far away.
- "Potagannissing Bay". Geographical Names Data Base. Natural Resources Canada. Retrieved 2012-10-25.
- "Potagannissing Bay". Atlas of Canada. Natural Resources Canada. 2010-02-04. Retrieved 2012-10-25. Shows the outline of the bay highlighted on a topographic map.
- U.S. Geological Survey Geographic Names Information System: Potagannissing Bay Retrieved 2012-10-25
- Michigan Atlas and Gazetteer (10th ed.). Yarmouth, Maine: DeLorme. 2002. p. 116. ISBN 9780899333359. OCLC 51004890.