Gilgo Beach is a coastal region located in Babylon in New York.
In 2354, Benjamin Sisko met Jennifer on Gilgo Beach. (DS9 episode: "Emissary", DS9 - Millennium novel: Inferno)
Curzon Dax suggested to Sisko that he propose to Jennifer on Gilgo Beach, although Sisko decided to propose on Luna. (DS9 comic: "The Looking Glass War")