The Harding River is a tidal estuary system located near Roebourne and Cossack in the City of Karratha. The river mouth is at the historic town of Cossack, originally named Tien Tsin after the barque that landed at this point. The overall character of paddling here is highly tide-dependent, with access changing quickly with the tides, making careful planning and safety essential. The river system is culturally significant, also known as Ngurin, and has a strong connection to the town of Roebourne. The Ieramargadu Pool on the river is the focus of the Ngurin Bush Tucker Trail, a 2 km self-guided walk. For paddlers, the primary considerations are the strong tidal influence and the need to coordinate trips with the tide cycle, particularly avoiding being caught on extensive mudflats during low water. Fishing activity is common, especially on the run-out tide when bait drains off the flats, indicating that paddlers should be aware of boat traffic, particularly near creek mouths and structure. There is a dam located on the river 23 kilometres south of Roebourne, but the paddling experience is predominantly within the tidal estuary nearer to Cossack. The area's aesthetic is shaped by its Pilbara location, with floodplain silt and clay noted in the surrounding geography.