| Belhavel Lough | |
|---|---|
| Claonloch (Irish) | |
 | |
  Location in Ireland | |
| Location | County Leitrim |
| Coordinates | 54°12′31″N 8°11′1″W / 54.20861°N 8.18361°W |
| Primary outflows | Diffagher River |
| Catchment area | 22.24 km2 (8.6 sq mi) |
| Basin countries | Ireland |
| Surface area | 1.01 km2 (0.39 sq mi) |
| Surface elevation | 60 m (200 ft) |
| References | [1][2] |
Belhavel Lough (Irish: Claonloch, meaning "crooked lake")[3] is a freshwater lake in the northwest of Ireland. It is located in north County Leitrim near the village of Killarga.
Belhavel Lough is about 2 kilometres (1.2 mi) south of Killarga and 5 km (3.1 mi) north of Drumkeeran.[1] It covers an area of 1.01 km2 (0.4 sq mi).[2] The lake drains east into the Diffagher River, which eventually reaches Lough Allen.[1]
The water quality was reported to be satisfactory c. 2001 – c. 2003 with a mesotrophic rating,[4][n 1] but had a "poor" ecological status c. 2007 – c. 2009 indicating pollution,[6] though Zebra mussel infestation was not reported.[7] The ecology of Belhavel Lough, and other county waterways, is threatened by curly waterweed, zebra mussel, and freshwater clam invasive species.[8][9]