The Acadia River flows Northerly over 82 km through seven municipalities in the MRC La Vallée-du-Richelieu, Les Jardins-de-Napierville and Le Haut-Richelieu, in Montérégie, on the South Shore of St. Lawrence river, the Quebec, Canada.

While the first settlers in the southern part (high) designate the "River of Morels" (Rivière des Morelles, in French).

This wild plant that grows on the banks of the river, produces black berries.

From 1548 on a map of Gastaldo, the place name "Arcadia" therein to designate the area of Maryland and Virginia.

According to Marcel Trudel, historian and teacher, Arcadia is a "place name that we carry to the north and turn under the influence of Mikmaq sounding in Acadia".

The name refers to a region of ancient Greece, the rich mythological and literary plan, often described as the land in excellence of serenity and happiness.

It sets the current spelling by dropping the letter R. At the time, the place name "Acadie" is assigned to the peninsula of Nova Scotia.

In the mid 18th century the "Great Upheaval" occurs when those who refused to pay allegiance to the Crown Brythonic were deported to the British colonies of the American coast.

In a conservation goal, the sector is subject to specific rules forbidding including any tree cutting, all new construction and all remblaiement.