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The Charles River is a Massachusetts river that separates Boston from Cambridge and Charlestown. It flows snakelike for 80 miles, starting at Echo Lake in Hopkinton, through 58 cities and towns in eastern Massachusetts, before emptying into Boston Harbor.
Harvard University, Boston University, and the Massachusetts Institute of Technology are all located along the Charles River; at Boston proper it opens out into a broad basin and is lined by parks (in one of which stands the Hatch Shell where concerts are given in summer evenings).
The river is well known for its rowing, sculling, and sailing, both recreational and competitive. The Head of the Charles Regatta is held annually, in October.