Rock Island is an island in Narragansett Bay

Narragansett Bay

Narragansett Bay is a bay and estuary on the north side of Rhode Island Sound. Covering 147 mi2 , the Bay forms New England's largest estuary, which functions as an expansive natural harbor, and includes a small archipelago...

 in Rhode Island

Rhode Island

The state of Rhode Island and Providence Plantations, more commonly referred to as Rhode Island , is a state in the New England region of the United States. It is the smallest U.S. state by area...

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Rock Island is a small rocky island near Pawtuxet Village

Pawtuxet Village

Pawtuxet Village is a section of the towns of Warwick and Cranston, Rhode Island. It is located at the point where the Pawtuxet River flows into the Providence River and Narragansett Bay.- History :...

and is now connected to the mainland by a causeway. The island is part of the Salter Grove public picnic ground and is the site for a proposed man-made salt marsh using dredged materials. The island contains several unusual fossils.