Ninigret is a coastal lagoon in Charlestown, Washington County, Rhode Island, United States. Located at (41°22′45″N71°38′43″W), it is the largest of nine such lagoons (often referred to as "salt ponds") in southern Rhode Island. It is utilized for recreational actives, as well as oyster and quahog harvesting. Ninigret Pond, like others in the region, was "formed after the recession of the glaciers 12,000 years ago". The pond is situated on low-lying ground, and as such, it is considered particularly vulnerable to storm surge flooding. It is connected to Green Hill Pond via a small channel. According to information compiled by the Rhode Island Sea Grant program, Ninigret Pond's watershed covers 7,645.65 acres (3,094.08 ha), of which 5,820.79 acres (2,355.59 ha) is occupied by water; Ninigret Pond itself has a surface area of 1,580.38 acres (639.56 ha), while other, smaller bodies of water account for the other 244.48 acres (98.94 ha).