Adelaide River is a river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in the Northern Territory

Northern Territory

The Northern Territory is a federal territory of Australia, occupying much of the centre of the mainland continent, as well as the central northern regions...

 of Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

. It starts in Litchfield National Park

Litchfield National Park

Litchfield National Park, covering approximately 1500 km2, is near the township of Batchelor, 100 km south-west of Darwin, in the Northern Territory of Australia...

 and flows generally northwards to Clarence Strait, being crossed by both the Stuart Highway

Stuart Highway

The Stuart Highway is one of Australia's major highways. It is a segment of Australia's Highway 1 extending from Darwin, Northern Territory, in the north, via Tennant Creek and Alice Springs, to Port Augusta, South Australia, in the south—a distance of...

 (at the township of Adelaide River

Adelaide River, Northern Territory

Adelaide River is a town where the Stuart Highway crosses the Adelaide River in the Northern Territory of Australia, upstream of the Adelaide and Mary River Floodplains Important Bird Area. At the 2006 census, Adelaide River had a population of 190...

) and the Arnhem Highway

Arnhem Highway

The Arnhem Highway is a 230 kilometre highway in the Northern Territory of Australia. It links the mining town of Jabiru, in Kakadu National Park, to the Stuart Highway 35 kilometres south of Darwin....

 (near Humpty Doo

Humpty Doo, Northern Territory

Humpty Doo is a small town in Australia's Northern Territory, situated just south of the Arnhem Highway, approximately 40 km from Darwin. At the 2006 census, Humpty Doo had a population of 5,413....

). The Adelaide River is well known for its high concentration of saltwater crocodile

Saltwater Crocodile

The saltwater crocodile, also known as estuarine or Indo-Pacific crocodile, is the largest of all living reptiles...

s, along with other wildlife including white-bellied sea eagle

White-bellied Sea Eagle

The White-bellied Sea Eagle , also known as the White-breasted Sea Eagle, is a large diurnal bird of prey in the family Accipitridae. Originally described by Johann Friedrich Gmelin in 1788, it is closely related to Sanford's Sea Eagle of the Solomon Islands, and the two are considered a superspecies...

s, whistling kite

Whistling Kite

The Whistling Kite is a medium-sized diurnal raptor found throughout Australia , New Caledonia and much of New Guinea . Also called the Whistling Eagle or Whistling Hawk, it is named for its loud whistling call, which it often gives in flight...

s, freshwater crocodile

Freshwater Crocodile

The freshwater crocodile , also known as the Australian freshwater crocodile, Johnston's crocodile or colloquially as freshie, is a species of reptile endemic to the northern regions of Australia...

s, bull shark

Bull shark

The bull shark, Carcharhinus leucas, also known as Zambezi shark or unofficially known as Zambi in Africa and Nicaragua shark in Nicaragua, is a shark common worldwide in warm, shallow waters along coasts and in rivers...

s and Black Flying-fox

Black Flying-fox

The Black Flying-Fox, Pteropus alecto, is a megabat in the family Pteropodidae. Members of the genus Pteropus include the largest bats in the world. The Pteropus genus has currently about 57 recognised species...

. Is lower reaches form part of the Adelaide and Mary River Floodplains Important Bird Area.