The Seal River is a river in the Northern Region of Manitoba, Canada. It travels 260 kilometres from Shethanei Lake to the Hudson Bay. The river was nominated for the Canadian Heritage Rivers System in 1987 and was officially listed in 1992. In January 2024, the Governments of Canada and Manitoba and Members of the Sayisi Dene First Nation, O-Pipon-Na …The Seal River is a river in the Northern Region of Manitoba, Canada. It travels 260 kilometres from Shethanei Lake to the Hudson Bay. The river was nominated for the Canadian Heritage Rivers System in 1987 and was officially listed in 1992. In January 2024, the Governments of Canada and Manitoba and Members of the Sayisi Dene First Nation, O-Pipon-Na-Piwin Cree Nation, Northlands Denesuline First Nation and Barren Lands First Nation reached an agreement to designate the watershed as an Indigenous and community conserved area.