East Islip is a hamlet in the Town of Islip, Suffolk County, New York. East Islip borders four other hamlets: Islip is to the west, Islip Terrace is to the north, North Great River is to the northeast, and Great River is to the east. The Great South Bay is to the south. It is the home of an experimental shellfish hatchery operated by the Town of Islip, near the town-operated public beach on the bay. East Islip is home to two public marinas and one private marina. Two additional marinas are operated in Great River within the grounds of the Timber Point Country Club, the site of East Islip's only golf course. East Islip continues its tradition of sports hunting and fishing, as its marinas are home to several annual fishing tournaments and its marshes continue to serve many duck and other water fowl hunters.