Nova Scotia's rivers all flow into the Atlantic Ocean through four unique watersheds: the Gulf of Maine, the Northumberland Strait, the Gulf of Saint Lawrence and into the Atlantic Ocean itself.
The Gulf of Maine system includes the Bay of Fundy, which includes the Cumberland and Minas Basins. In Nova Scotia, the system occupies the shores from Fort Lawrence to Cape St. Mary (44°05′N).
The Bay of Fundy coastline in Nova Scotia begins at Fort Lawrence and circles Cape Chignecto eastward to Truro. It then follows west along the Annapolis Valley as far as Brier Island on the Digby Neck. Within the Bay of Fundy are two basins: Chignecto Bay which begins at Fort Lawrence and ends at Cape Chignecto, and the Minas Basin that encompasses everything east of Ramshead Point (near Diligent River) and Cape Split.
The Minas Basin flows into the Bay of Fundy between Ramshead Point and Cape Split.
The Gulf of Maine coastline in Nova Scotia begins at Brier Island and continues to Cape St. Mary.
The Atlantic Ocean coastline in Nova Scotia begins at Cape Sable Island and continues to Cape Canso (). The list is divided into the geographical shorelines in the province.
The South Shore extends from Cape Sable Island to Halifax Harbour.
The Eastern Shore extends from Halifax Harbour to the Strait of Canso.
The Gulf of Saint Lawrence coastline in Nova Scotia begins at Cape Canso () and continues to Cape George Point.
The Northumberland Strait coastline in Nova Scotia begins at Cape George Point and continues to the Tidnish River.