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Charles River

River in Charles River Reservation, Henry L Shattuck Reservation, Rocky Narrows Reservation, Medfield Charles River State Reservation, Elm Bank Reservation in Franklin Town, MA
Massachusetts Freshwater Fishing Regulations
Massachusetts Saltwater Fishing Regulations
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Length
81mi

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On Wikipedia
The Charles River (sometimes called the River Charles or simply the Charles) is an 80 mi (129 km) long river in eastern Massachusetts. From its source in Hopkinton the river flows in a northeasterly direction (after first coursing due south through Milford), traveling through 23 cities and towns before reaching the Atlantic Ocean at Boston.
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