The Allyn River is a river of the state of New South Wales

New South Wales

New South Wales is a state of :Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales...

 in 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 originates in the World Heritage Barrington Tops region, flowing through Antarctic Beech

Nothofagus moorei

Nothofagus moorei, is an important Gondwana relict of the rainforests of the southern hemisphere. It occurs in wet, fire free areas at high altitude in eastern Australia....

 high altitude rainforest. And then through lower altitude sub tropical rainforest including trees such as Red Cedar

Toona ciliata

Australian Red Cedar , Toona ciliata is a forest tree in the family Meliaceae which grows throughout southern Asia from Afghanistan to Papua New Guinea and Australia. In Australia its natural habitat is now extensively cleared subtropical rainforests of New South Wales and Queensland...

 and Small leaf fig

Ficus obliqua

Ficus obliqua, commonly known as the Small-leaved Fig, a tree in the family Moraceae native to eastern Australia. It is a banyan of the genus Ficus which contains around 750 species worldwide in warm climates, including the edible fig...

. Some of the River Oak

Casuarina cunninghamiana

Casuarina cunninghamiana is a she-oak species of the genus Casuarina. The native range extends from Daly River in the Northern Territory, north and east in Queensland and eastern New South Wales.-Description:...

growing beside the stream are over 50 metres in height. Logging has been practiced in the area since the 1820s.