St. Lawrence River Divide

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The St. Lawrence River Divide follows the southern boundary of the St. Lawrence River watershed, except for its easternmost portion, which extends into New Brunswick and Nova Scotia.
A map of the principal hydrological divides of North America. The St. Lawrence River Divide (magenta line) separates the Great Lakes-St. Lawrence watershed from the southerly watersheds of the Atlantic Ocean.

The Saint Lawrence River Divide is a continental divide in central and eastern North America that separates the Great Lakes-St. Lawrence River Basin from the southerly Atlantic Ocean watersheds. Water, including rainfall and snowfall, lakes, rivers and streams, north and west of the divide, drains into the Gulf of St. Lawrence or the Labrador Sea; water south and east of the divide drains into the Atlantic Ocean (east of the Eastern Continental Divide, ECD) or Gulf of Mexico (west of the ECD). The divide is one of six continental divides in North America that demarcate several watersheds that flow to different gulfs, seas or oceans.