Stewarts River is a perennial stream located in the Camden Haven area of New South Wales' Mid North Coast. It rises on the northern slopes of Big Nellie within Coorabakh National Park, west of Hannam Vale, flowing east by south and then east before joining the Camden Haven River and reaching its mouth at Watson Taylor Lake. The river descends 132 metres over its 62-kilometre course.

Access is via Wharf Road at Johns River, where the highway crosses the river. The approach along Wharf Road takes paddlers away from the Pacific Highway and through an avenue of pine trees to the riverbank. The access point is described as somewhat awkward, though the reward is a largely undisturbed stretch of water.

The paddleable section meanders gently for approximately 5 kilometres through rural land before opening into Watson Taylor Lake. Heading upstream from the put-in toward the railway bridge, the river narrows and trees lean across the water. Water levels can be lower in this upper section, which may produce a swampy odour, though this dissipates further downstream. The river's course through rural land and riparian vegetation means it is not visible from the highway, contributing to its low profile as a paddling destination.

Wildlife is a notable feature of the river. Azure kingfishers are present in good numbers — sightings of several together have been reported, which is considered unusual. Fish are active throughout the river, and birdsong is prominent in the tree canopy. The dappled light through the riverside vegetation creates strong reflections on the water's surface.

Watson Taylor Lake, which the river flows into, opens into a broad panoramic expanse and can be incorporated into a day trip as an extension of the river paddle. The combination of the narrow, tree-lined river and the expansive lake makes for a varied outing.

Stewarts River is considered the least-known paddling destination in the Camden Haven area, and paddlers can generally expect to have the water to themselves. No specific restrictions or regulations on paddling are noted for this waterway.