Narragansett Bay is an estuary in New England, and the heart of the Narragansett Bay watershed. An estuary is a body of water where rivers meet the sea.

By definition, a watershed is the land area that drains into rivers, streams, lakes or estuaries. Some 40% of the Narragansett Bay watershed is in Rhode Island, but over 60% of the watershed is actually in Massachusetts.

The maps below display the major basins that make up the Narragansett Bay watershed and the bathymetry of the Narragansett Bay estuary.

Narragansett Bay Watershed map topography and watershed basins