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The borough was created following the municipal mergers of 2002 and consisted of the former municipalities of L'Île-Bizard, Sainte-Geneviève, and Sainte-Anne-de-Bellevue. The latter two are widely separated portions of the Island of Montreal, and the first is a separate island, the largest of the City of Montreal besides the Island of Montreal itself.
Upon the demerger in 2006, the town of Sainte-Anne-de-Bellevue voted to separate from the city of Montreal. The remainder of the borough remained in Montreal and became the borough of L'Île-Bizard–Sainte-Geneviève.