The Woonasquatucket River is a river in the U.S. state of Rhode Island. It flows approximately 15.8 miles (25.4 km) and drains a watershed of 130 km2 (50 sq mi).

The Blackstone River is a river in the United States that flows through the states of Massachusetts and Rhode Island. It is 48 mi (77 km) long with a drainage area of 540 sq mi (1,400 km2) and drains into the Seekonk tidal river at Pawtucket, Rhode Island. Its long history of industrial use has caused significant pollution, with the United States Environmental Protection Agency describing it as “the most polluted river in the country because of high concentrations of toxic sediments.”