Portrush Harbour sits on the north coast of Northern Ireland, on the west side of the Ramore Head promontory, approximately ten miles east of the entrance to Lough Foyle.

Enclosed by two substantial piers built from rock quarried from Ramore Head in the early 19th century, it offers good shelter in most conditions, though strong north or northwesterly winds can drive a swell inside, making berths uncomfortable.

Vessels can berth alongside a pontoon or pick up moorings within the harbour. Entry is straightforward: mariners pass between the lighted pierheads on a leading bearing of 028 degrees, keeping north of the marks as the water shallows quickly toward the beach.

Siltation has reduced depths at the entrance, and vessels drawing more than two metres are advised to contact the harbour office before approaching.

A sandbar forms just outside the entrance at mean low water springs, with a maximum depth of three metres inside. RNLI lifeboats have operated from the harbour since 1860.