The Moppy River is a perennial river in New South Wales, Australia, forming part of the Manning River catchment. It rises in the Barrington Tops National Park on the eastern slopes of the Mount Royal Range, near Thunderbolts Lookout, at an elevation of approximately 1,500 metres. Over its 22-kilometre course, the river descends 1,140 metres before reaching its confluence with the Barrington River near the village of Moppy. This dramatic elevation drop defines the river's character as a fast, continuously dropping waterway.

The primary paddled section runs from Moppy to Cobark on the upper Barrington River. This is a demanding trip, estimated at around 40 minutes under typical conditions, featuring near-continuous grade 2 and grade 3 rapids. The river is notably narrow throughout, with few eddies, and the channel runs through trees, which adds to the technical challenge and requires attentive navigation. The surrounding bush is considered very attractive and imparts a strong sense of wilderness.

A low-level bridge located after the halfway point may require portaging depending on river height. At flood levels, the bridge becomes submerged and the river becomes significantly more dangerous — with few eddies and the current running through the trees, only very experienced paddlers should consider entering the river under those conditions. Because of the river's small size and narrow width, paddling in small groups is strongly advised.

There are no specific restrictions or regulations for paddling this section, but the technical nature of the water demands appropriate whitewater skills. The combination of continuous rapids, limited recovery zones, and tree-lined banks means that swimmers face real hazards, and paddlers should be competent in self-rescue. The section is best suited to those with solid grade 3 whitewater experience, and caution is warranted whenever the river is running high or in flood.