The Coxs River, a perennial river that is part of the Hawkesbury-Nepean catchment, is located in the Central Tablelands, Blue Mountains, and Macarthur regions of New South Wales, Australia.Course and featuresThe Coxs River rises in Gardiners Gap, within Ben Bullen State Forest, east of Cullen Bullen, and flows through the Megalong Valley and parts of the Greater Blue Mountains Area World Heritage Site including the Blue Mountains and Kanangra-Boyd national parks, heading generally south and then east, joined by fifteen tributaries including the Little, Jenolan, Kedumba, Kowmung, and Wollondilly rivers, before reaching its confluence with the Warragamba River to form Lake Burragorang. The river descends over its 155km course.