Trepang Bay is a remote and pristine tidal estuary situated on the Cobourg Peninsula within the Garig Gunak Barlu National Park in Arnhem Land, Northern Territory. This area is part of the traditional lands of the Iwaidja-speaking Aboriginal people and lies within the broader Cobourg Marine Park. The bay is characterized by mangrove-lined creeks, shallow gutters, and a rich marine ecosystem that supports a diverse fishery. Access is extremely limited due to its protected status and remote location, requiring permits and often a guided expedition. The environment is wild and untamed, offering a true wilderness fishing experience for species like barramundi in a setting of significant cultural and natural heritage.