Deux-Montagnes (French pronunciation: [dø mɔ̃taɲ]) is a suburban municipality in Southwestern Quebec, Canada on the north shore of the Rivière des Mille Îles where it flows out of Lake of Two Mountains (French: Lac des Deux Montagnes).

[4] Ten thousand years ago at the end of the pleistocene, the Champlain Sea covered a large part of southern Quebec and left behind the clay, sand and peat soil that is now under the city of Deux-Montagnes.

When the sea retreated to the Atlantic Ocean, along the channel that is now the St-Lawrence River and its tributaries, the Rivière-des-Milles-Iles and the Lake of Two-Mountains, southern Quebec became a favourable area for hunting and gathering.

[6] Population trend:[7] In 1930 a new chapel was built in response to a request from parishioners of St-Eustache-sur-le-lac, where Monseigneur George Gauthier, Archbishop of Montreal gave permission to replace the small Bélair chapel, that was "located on the Chemin du Grand-Moulin at the foot of De La Chapelle street, on the banks of the Rivière des Mille Îles"(Plante, p. 174).

(Plante p. 174-176) Most Reverend Emilien Frenette, who was then Bishop of Saint-Jerome, founded the Holy Family Parish on December 26, 1957.

This community attended their first meeting on August 19, 1927, "in the new church built by volunteers on the corner of 8th and Cedar avenues" (Plante p. 179).

Because of the demand for a bigger space, the congregation moved to a mansion on the corner of 11th avenue and Boulevard du Lac, and renovated and enlarged the premises.

The books were eventually transferred to the local Club Femina where Annette Magnan offered many services in the St-Eustache-sur-le-lac library until her death in 1975.

Its mission is to "empower volunteers to serve their communities, meet humanitarian needs, encourage peace and promote international understanding through Lions clubs.

(Plante p. 182) The original Lake of Two Mountains High School was at the corner of 14th avenue and Chemin d’Oka where its first class graduated in 1954.

(Plante p. 183) Built in the early 1960s on the corner of Guy Street and 20th Avenue, St-Eustache sur-le-Lac Elementary School (as it was originally called) served the English-speaking, non-catholic (i.e.Protestant) community, before the implementation of the non-denominational school board system throughout Quebec.