The name of this electoral district derives from the fact that its southern boundary borders the Mille-Îles River.
(Population: 108,875)
Consisting of that part of the Regional County Municipality of Thérèse-De Blainville comprised of: the cities of Blainville, Lorraine, Bois-des-Filion, Sainte-Thérèse, and that part of the City of Rosemère lying northeasterly of the Agence métropolitaine de transport railway.
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