The national park is situated near Laurieton, and is approximately 365 kilometres (227 mi) northeast of Sydney.

The local aboriginal people tell a dreamtime story of three brothers of the Birpai tribe who were killed by a witch called Widjirriejuggi and were buried where the mountains stand.

[1] By amazing coincidence, when Captain James Cook passed the area on 12 May 1770 he named the mountains Three Brothers, since "these Hills bore some resemblance to each other".

[2] Cook had earlier (25 January 1769) written of the Three Brothers hills west of Cape St Diego, so perhaps he was inspired by them too.

North Brother Mountain (Dooragan) supports a wide range of vegetation communities – including some of the best examples of old growth blackbutt forest in the area and pockets of sub-tropical rainforest – that provide habitat for gliders, bats and koalas.