Swampy Plain[1] River (and in some places Swampy Plains River), a perennial stream that is part of the Murray catchment within the Murray–Darling basin, is located in the Snowy Mountains bioregion of New South Wales, Australia.

The river rises on the southern slopes of Mount Kosciuszko within the Kosciuszko National Park and, at an elevation of 2,120 metres (6,960 ft), is believed to be the highest river in Australia.

Water from the power plant is discharged into the reservoir, before passing over the spillway of Khancoban Dam, and down the Swampy Plain River.

The river is a popular place for fly fishing,[5][6] with a significant stock of brown and rainbow trout.

[4] The historic and iconic Hannel's Spur Track leads up from a signed trailhead near the Swampy Plains River to the very summit of Mount Kosciuszko.