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is a town located in central Suffolk County, New York, USA, and stretches from the North Shore to the South Shore of Long Island. Brookhaven is part of the New York metropolitan area. The population of the town was 448,248 at the 2000 census. It is largest town (by area) in the state of New York, and the second most populous, exceeded only by the Town of Hempstead in Nassau County.
According to the United States Census Bureau, the town has a total area of 531.5 square miles (1,376.6 km²), of which 259.3 square miles (671.6 km²) is land and 272.2 square miles (705.1 km² or 51.22%) is water. It is the largest town in New York in terms of total area. Excluding water, however, there are four towns in the state with more land area: Webb in Herkimer County, Long Lake in Hamilton County, Arietta in Hamilton County, and Ohio in Herkimer County.
It has coastline on both the Atlantic Ocean and Long Island Sound. Riverhead and Southampton lie to the east, and Smithtown and Islip lie to the west.
It has a large hill, known as "Bald Hill", in the hamlet of Farmingville, which marks where the glacier which formed Long Island stopped. At the top of Bald Hill is a Vietnam Veterans Memorial.