River, New South Wales, Australia.
Rising in the Great Dividing Range , it flows 293 mi (472 km) northeast to the Tasman Sea north of Sydney . Known as the Wollondilly in its upper course and as the Warragamba after receiving the Nattai River, it becomes the Hawkesbury after its junction with the Grose. It continues for 100 mi (160 km), becoming a salt tidal stream.