<P> Gardiner 's Island is a small island in the Town of East Hampton , New York , in Eastern Suffolk County . It is located in Gardiner 's Bay between the two peninsulas at the East end of Long Island . It is 6 miles ( 9.7 km ) long , 3 miles ( 4.8 km ) wide and has 27 miles ( 43 km ) of coastline . The island has been owned by the Gardiner family and their descendants since 1639 when Lion Gardiner purchased it from the Montaukett chief Wyandanch . It is one of the larger privately owned islands in the United States , and is slightly smaller than Naushon Island in Massachusetts , owned by the Forbes Family . </P>
<P> Gardiner 's Island is a small island in the Town of East Hampton , New York , in Eastern Suffolk County . It is located in Gardiner 's Bay between the two peninsulas at the East end of Long Island . It is 6 miles ( 9.7 km ) long , 3 miles ( 4.8 km ) wide and has 27 miles ( 43 km ) of coastline . The island has been owned by the Gardiner family and their descendants since 1639 when Lion Gardiner purchased it from the Montaukett chief Wyandanch . It is one of the larger privately owned islands in the United States , and is slightly smaller than Naushon Island in Massachusetts , owned by the Forbes Family . </P>
largest privately owned island in the united states
largest privately owned island in the united states
Gardiner 's Island
Gardiner 's Island