The Behy River is a short whitewater run located in County Kerry, Munster, in the southwest of Ireland. The run covers approximately 3 kilometres and is graded 2 to 3, making it a moderately technical paddle suited to paddlers with some whitewater experience. It is described as a winding grade 2+ river that responds to recent rainfall, meaning water levels can vary considerably and the run is best attempted after wet weather.

The character of the river is tight and technical, with low canopy cover noted by at least one paddler who completed what is believed to be the first known canoe descent of the river. That descent was made in a 14-foot Canadian canoe, suggesting the river is navigable by open canoes as well as kayaks, though the tight and technical nature of the water warrants careful consideration of craft choice and paddler skill.

The Behy flows near the village of Glenbeigh on the Iveragh Peninsula, part of the Ring of Kerry. The surrounding landscape is characterised by boggy marshland, sand dunes, and estuary flats where the river meets the sea. The river is also known locally as a sea trout fishery, and anglers use the waterway, which is worth bearing in mind when planning a trip.

Given its rain-dependent nature, the Behy is most reliably paddled during the wetter months typical of the Kerry climate. Paddlers should assess recent rainfall before committing to the run, as low water levels may make the river unrunnable or significantly alter the character of the rapids.