Description: These polygons depict the boundaries of 69 near-shore estuarine and interestuarine watersheds within the Massachusetts Bays Program management area. These watersheds are located along the eastern Massachusetts coast from the Merrimack River in the north to Provincetown Harbor at the tip of Cape Cod. They are intended to encompass all tributary areas that are tidally influenced, as well as open water regions within the estuaries and other offshore areas that contain important ecological resources.