Minesing Wetlands, previously known as Minesing Swamp, is a Ramsar boreal wetland in central Ontario, Canada stretching from the western periphery of Barrie to Georgian Bay. It was identified and classified through the International Biological Program. It is "the largest and best example of fen bog in southern Ontario", one of the "most diverse undisturbed wetland tracts in Canada" and is a provincially significant Area of Natural and Scientific Interest. The term minesing is of Ojibwe origin and means "island", referring to an island located within Lake Edenvale, which encompassed the present-day wetlands and surrounding areas.