The Mystic River is a 7.0-mile-long (11.3 km) river in Massachusetts
, in the United States
. Its name derives from the Wampanoag word "muhs-uhtuq", which translates to "big river." In an Algonquian language, "Missi-Tuk" means "a great river whose waters are driven by waves", alluding to the natural tidal nature of the Mystic.
Mystic River was home to great numbers of many species of fish, including salmon, alewife, blueback herring, striped bass, bluefish, smallmouth bass, largemouth bass, bluegill, carp, and more.The river gave its name to the 2001 Dennis
Lehane novel and its 2003 Academy Award winning Clint Eastwood film adaptation Mystic River.