Great River, a hamlet in Islip, NY, was originally inhabited by the Secatogue Algonquins. Named "Connetquot" (meaning "Great River"), it was part of a 1683 land purchase by William Nicoll, who established Islip Grange. Known as Youngsport in the 1840s due to the Youngs family's boat-building, it became a haven for wealthy families’ estates in the 19th century. The Long Island Rail Road’s expansion to nearby Oakdale boosted accessibility. Today, it’s a suburban community with historic sites like