The Wenlock River is a river located on the Cape York Peninsula in Far North Queensland, Australia.
The river rises on the western slopes of the Great Dividing Range below Jacks Knob, west of Nundah homestead. The river flows generally north-west through tropical savanna plains and wetlands, joined by fifteen minor tributaries, before reaching its mouth and joining with the Ducie River on the western side of the peninsula at Port Musgrave, just north of Mapoon. Finally, the Wenlock River enters the Gulf of Carpentaria and descends 215 metres over its 322-kilometre course. The total catchment size is 7,526 square kilometres.
The river has no water storage facilities built on it and there is little development within the drainage basin, resulting in a low population. In 2010, the Queensland Government declared the river a wild river, one of thirteen Queensland rivers that are free of dams, weirs, irrigation schemes and industrial development, and remain largely intact.
Much of the river is bordered by gallery rainforests which provide habitat for animals such as the white-tailed rat, spotted cuscus and palm cockatoo. During the wet season the river floods, replenishing the wetlands. With some 48 species, the river contains the highest diversity of freshwater fish of all Australian rivers, many of which are shared with the rivers of southern New Guinea. They include Buffons river garfish and fimbriate gudgeon, as well as the freshwater sawfish and more common species such as the sooty grunter, saratoga and barramundi. The river is also home to one of Queenslands largest breeding populations of the saltwater crocodile.
