Wollongong, a seaport of Camden county, New South Wales, Australia, 49 m. by rail S. of Sydney, the third port and chief harbour on the S. coast of the colony. Pop. (1901) 3545. Its harbour, known as Belmont Basin, is excavated out of the rock, having an area of 3 acres, and a depth of 18 ft. at low water. A breakwater protects its mouth; it has a lighthouse, and is defended by a fort on Signal Hill. It is the port for the OsborneWallsend and Mount Pleasant collieries, which are connected with it by rail. It lies at the foot of Mount Keira, amid fine mountain and coast scenery.