Frenchman Island

Frenchman Island
Postcard showing Frenchman Island's steamboat landing in 1910.
Frenchman Island
Location of Frenchman Island in New York State
Geography
LocationOneida Lake
Coordinates43°13′06″N 76°02′59″W / 43.21833°N 76.04972°W / 43.21833; -76.04972
Area26 acres (11 ha)
Highest elevation384 ft (117 m)
Administration
StateNew York
CountyOswego
TownConstantia

Frenchman Island (also known as Frenchman's Island) is a 26-acre (11 ha) island located in Oneida Lake in Oswego County, New York, United States. It was known historically as "Seven Mile Island" during the American Revolution and by the Onondaga people as Kah-wha-nah-kee.

Though it was once home to a popular resort, the island is today uninhabited and largely undeveloped, with the exception of an abandoned lighthouse and dock on the south side of the island. The island is open to the public for recreational use, however it can only be reached by boat.