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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. 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.
The river was named in 1895 by John DouglasCBE after the surveyor, John Thomas Embley (1858-1937), while Douglas was Government Resident on Thursday Island.