The Namoi River is a substantial inland waterway in north-western New South Wales, draining a catchment of approximately 42,000 square kilometres. It originates in the tablelands at elevations above 1,000 metres and flows down through diverse landscapes to the lowland floodplains to the south-west, where it eventually joins the Barwon River at the town of Walgett.

The river carries characteristically muddy water and passes through semi-arid country, with sections flanked by dense eucalyptus woodland. The overall character of paddling here is remote and outback in nature, with the river winding through quiet bush settings that support notable birdlife and floodplain vegetation. Paddlers should expect a dry inland environment rather than lush riparian scenery.

Walgett is the most commonly referenced put-in location, where the Namoi meets the Barwon River. The town's name derives from the Gamilaraay word for "the meeting of two waters," reflecting the cultural significance of this confluence to the local Indigenous people. A paddle at Walgett covering both the Namoi and Barwon rivers runs approximately 20 kilometres return and takes around four hours to complete. The Manilla River, in the upper reaches of the Namoi catchment, is also paddled as part of multi-day trips through the region.

The river is described as still flowing in its outback sections, which is worth noting given the variable nature of inland NSW waterways. Paddlers planning trips to this region should verify flow conditions in advance, as inland rivers in this part of New South Wales can be highly seasonal and subject to significant variation depending on rainfall and upstream water management. Split Rock Reservoir and Lake Keepit, both associated with the broader Namoi Valley, offer additional flat-water paddling options in the same general area.