The Mersey River, formerly known as Rivière Rossignol by the Acadians, is a river in Nova Scotia, Canada. It is named after the River Mersey in Liverpool, England. The river proper flows from the eastern end of Eleven Mile Lake in Annapolis County southward to Kejimkujik Lake in Kejimkujik National Park, then through Lake Rossignol to empty into the Atlantic Ocean at the town of Liverpool, Nova Scotia.