They are located in Put-in-Bay Township, Ottawa County in the state of Ohio.
The Bass Island Archipelago includes the three Bass Islands, plus the Ohio islands of Ballast, Buckeye, Catawba, Gibraltar, Green, Kelleys, Lost Ballast, Mouse, Rattlesnake, Starve, and Sugar, and the Ontario islands of East Sister, Hen (including her three "chickens": Big Chicken, Chick, and Little Chicken), Middle, Middle Sister, North Harbour, and Pelee.
The village of Put-in-Bay on South Bass Island is a popular tourist stop during the summer.
Perry's Victory and International Peace Memorial, commemorating the Battle of Lake Erie, is located on South Bass Island, near Put-In-Bay.
The island is also the annual host of the Inter-Lake Yachting Association regatta, known as Bay Week.