The Glenaniff River is a 3-kilometre whitewater run in County Leitrim, Connacht, graded 4 to 5. The river is notable for its 11 waterfalls, one of which is described as quite high with a shallow landing at the bottom. A path has been constructed along the river corridor, making it straightforward to inspect and portage the falls before committing to any drops. The river flows into Lough Melvin, finishing at the Rossinver organic centre, which is well signposted in the area.

The put-in involves a small, narrow road with poor parking, though the river runs directly alongside it. A picnic area is located adjacent to the river near the takeout. There is no phone coverage in the area, which is a significant safety consideration — paddlers should be self-sufficient and experienced before attempting this run.

The first four drops are considered the most consequential section, described as a boat breaker at any level. Extreme caution is warranted throughout. The grade can shift depending on water levels. One of the waterfalls is noted as quite high with a shallow pool below, making inspection essential before running. The constructed path along the falls makes this inspection practical.

The Glenaniff is also an important salmon spawning river. At the takeout, it is possible to observe salmon attempting to move upstream, particularly in the lower sections. The upper portions of the river are likely too high in gradient for salmon to reach. Paddlers should be aware of this ecological significance when planning a trip.

The river has been paddled at low-to-medium levels, and grading is understood to vary with flow. Given the limited published information and the serious nature of the hazards — particularly the shallow waterfall and the absence of mobile phone coverage — this run is best suited to experienced whitewater paddlers who can assess conditions on the day and are comfortable with on-site inspection and portaging.