The river has a catchment area of 4,622 square kilometres (1,785 sq mi) of which an area of 392 square kilometres (151 sq mi) is composed of estuarine wetlands.[3] From source to mouth, the Embley River is joined by five tributaries including the Hey River. The Embley River descends 21 metres (69 ft) over its 54-kilometre (34 mi) course.[2]