Boat Harbour, Public beach in Kurnell, Australia.

Boat Harbour is a small curved cove on the southern side of Botany Bay National Park in Kurnell, with pale tan sand meeting water that shifts from turquoise to dark blue. A flat brown and orange rock shelf crosses the foreground, and low green vegetation rises behind the beach toward a flat area with small cabins and parked vehicles. The rock platform and reef on the southern side are known as The Merries.

The Gweagal, a clan of the Dharawal, are the traditional custodians of this land. In 1815 a 700-acre grant including Boat Harbour was issued to whaler James Birnie, who named it Alpha Farm; after he was declared insane in 1828 it passed to John Connell, then in 1861 was sold to Thomas Holt for £3275.

The beach lies within the lands of the Gweagal clan of the Dharawal people, the traditional custodians of Sydney's southern areas. Since late 2001 it has been an aquatic reserve, which restricts fishing and bait collection. The site holds many temporary shacks built from corrugated iron or shipping containers, with no permanent housing on or near the sand.

Boat Harbour lies on the southern side of Botany Bay National Park at Kurnell, in Sydney's south, not north of the city. Since May 2010 the sand dunes have been closed to vehicles, but driving on the beach itself is still allowed. The beach is reached by sandy tracks behind the sand; the rock shelf and reef called The Merries lie on the southern side.

The reef on the southern side, called The Merries, wrecked three ships: the steamer Ninevah ran aground in fog in 1895 and was refloated on the rising tide, the Koonya broke up in 1898, and the collier Marjorie was stranded in 1905 until part of its cargo was thrown overboard. No one died.