Along the Boston side of the Charles River, which separates the city from Cambridge, is roughly three-mile leafy path known as Esplanade. To its west is the Boston University Bridge, along the line there are playgrounds and marshes and places to rent boats and kiosks. The River has 20 dams, bridges and the Museum Of Science connecting the two banks. The river twists and turns along an 80 mile course, always brownish in colour flows through 23 communities, due to its meandering nature.
Massachusetts has 28 distinct water sheds that feed six large river basins. The Connecticut River drains nearly one third of the state- land between the peaks of the Berkshires and the Worcester Plateau, watersheds feed the Merrimack River, and make their way to coast. Watersheds do not conform to political boundaries thus walled along their banks.