After touring the montérégienne plain, Acadia river empties into the Richelieu River at the mouth of the Chambly Basin; the mouth of the river is part of Carignan. In the last segment of its course, the river flows along the road 223 (Bellerive path) that bypasses by the North the Demers Island and Grande île (Great Island), located at the north of the Chambly Basin.
