Gloucester River rises within Gloucester Tops, on the eastern slopes of the Great Dividing Range, south east of Gloucester, and flows generally east northeast, joined by six tributaries including the Avon, Barrington, and Bowman rivers, before reaching its confluence with the Manning River, west of Wingham. The river descends 1,150 metres (3,770 ft) over its 102 kilometres (63 mi) course.[1]