The Mulgrave River is a significant freshwater stream system in the Wet Tropics region of north-east Queensland, flowing through diverse landscapes from its headwaters to its lower tidal reaches. It forms part of the larger Russell-Mulgrave River system, known for its rich biodiversity and dynamic seasonal changes driven by the tropical climate. The river's character shifts dramatically between the dry and wet seasons, with substantial flooding events reshaping instream habitat and influencing fish populations. Access is primarily by boat from specific points, with the river offering a mix of open water, deeper pools, and structured habitats that support a variety of iconic Australian freshwater species.