File:Entering Ile de Montreal, Montreal, Quebec (29773237760).jpg

The Island of Montreal (French: Île de Montréal, Kanien’kéha: Tiohtià:ke), in southwestern Quebec, Canada, is located at the confluence of the Saint Lawrence and Ottawa rivers. It is separated from Île Jésus (Laval) by the Rivière des Prairies.

It is the largest island in the Hochelaga Archipelago, and the second largest in the Saint Lawrence River (following Anticosti Island in the Gulf of Saint Lawrence). The St. Lawrence widens into Lake Saint-Louis south-west of the island, narrows into the Lachine Rapids, then widens again into the Bassin de La Prairie before becoming the St. Lawrence again and flowing toward Quebec City. Saint Helen's Island and Notre Dame Island are in the Saint Lawrence southeast of downtown Montreal.

The Ottawa widens and becomes Lac des Deux-Montagnes north-west of the island. The Sainte-Anne-de-Bellevue Canal, between the western tip of the island and Île Perrot, connects Lac des Deux-Montagnes and Lake Saint-Louis. Another outlet of Lac des Deux-Montagnes, the Rivière des Prairies, flows along the north shore of the island and into the St. Lawrence at the northeastern tip of the island.

The island is approximately 50 km long and 16 km wide at its widest point. The area of the Urban agglomeration of Montreal, which includes the Island of Montreal and several other smaller islands, is 499 km². The island of Montreal has a shoreline of 266 km. At its centre are the three peaks of Mount Royal. The southwest of the island is separated by the Lachine Canal between Lachine and Montreal's Old Port; this portion of the island is partially divided further by the Canal de l'Aqueduc, running roughly parallel to the Lachine Canal, beginning in the borough of LaSalle and continuing between the boroughs of Le Sud-Ouest and Verdun.

The island of Montreal is the major component of the territory of the city of Montreal, along with Île Bizard, Saint Helen's Island, Notre Dame Island, Nuns' Island, and some 69 smaller islands. With a population of 1,861,900 inhabitants (22% of the population of Quebec), it is by far the most populous island in Canada. It is also the 6th most populous island of the Americas and the 37th most populated island on earth, outranking Manhattan Island in New York City. Montreal and the other municipalities on the island compose the administrative region of Montréal.

The crossings which connect the island to its surroundings are some of the busiest bridges in the country and the world. The Champlain Bridge and the Jacques Cartier Bridge together accommodate 101 million vehicle crossings a year.

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