Boat Harbour is a small beach located on the southern side of the Botany Bay National Park in Kurnell, Sydney, New South Wales, Australia.

700 acres (2.8 km2) of land on the Kurnell Peninsula which also included Boat Harbour was issued to James Birnie, a whaler and merchant.

[2] The coastline in the area is generally east-west, making it a potential hazard for northbound shipping, especially prior to the building of the Cape Baily Light.

In 1895, the Aberdeen White Star Line passenger steamer Ninevah, on its way from London to Sydney, ran aground on this reef, during a fog.

[3][4][5] In 1898, the Moruya Steamship Company's small coastal steamer, Koonya, ran onto the rocks here at night during heavy rain and broke up.

[6][7] In 1905, the Bellambi Coal Company's collier Marjorie ran aground at night and was stranded on this reef, until part of her cargo was jettisoned and she was relocated.