TheTiasquam River is a 3.7-mile-long (6.0 km)[1] stream on the southwest ofMartha's Vineyard,Massachusetts.
The creek arises in the eastern section ofChilmark, and flows generally east, then south, intoWest Tisbury, Massachusetts to feed theTisbury Great Pond, which in turn empties into theAtlantic Ocean from the island's southern shore.