Beavertail Lighthouse was built in 1856 and is the premier lighthouse in Rhode Island, marking the entrance to Narragansett Bay. The 64-foot (20 m) lighthouse lies on the southernmost point of Conanicut Island in the town of Jamestown, Rhode Island in Beavertail State Park, on a site where beacons have stood since the early 18th century. The light provides navigation for boats and ships entering Narragansett Bay in the East Passage between Conanicut Island and Newport, Rhode Island on Aquidneck Island. Other lighthouses are visible from Beavertail Lighthouse, such as Castle Hill Lighthouse, Point Judith Light, and Rose Island Light.

Jamestown is a town in Newport County, Rhode Island in the United States. The population was 5,559 at the 2020 census. Jamestown is situated almost entirely on Conanicut Island, the second largest island in Narragansett Bay. It also includes the uninhabited Dutch Island and Gould Island.