The River Erne in Ballyshannon
|Native name||An Éirne|
|Country||Ireland, Northern Ireland|
Slieve Glah, County Cavan|
~255 m (837 ft)
|River mouth||Atlantic Ocean at Ballyshannon|
|Length||~129 km (80 mi)|
|Basin size||4,372 km2 (1,688 sq mi)|
The River Erne (// AIRN, Irish: Abhainn na hÉirne or An Éirne) in the northwest of Ireland, is the second-longest river in Ulster. It rises on the east shoulder of Slieve Glah mountain  three miles south of Cavan in County Cavan and flows 80 miles (129 km) through Lough Gowna, Lough Oughter and Upper and Lower Lough Erne, County Fermanagh, to the sea at Ballyshannon, County Donegal. For 30 miles from Crossdoney in County Cavan to Enniskillen in County Fermanagh, it is difficult to distinguish the river as it winds its way through interconnected loughs or parts of loughs nestling among the drumlin hills of Cavan and south Fermanagh. The river is 120 kilometres long and is used for fly fishing for trout and salmon, with a number of fisheries along both the river itself and its tributaries. The town of Enniskillen is mostly situated on an island in the river, between Upper and Lower Lough Erne. It is linked to the River Shannon by the Shannon–Erne Waterway. The total catchment area of the River Erne is 4,372 km2. The long-term average flow rate of the River Erne is 101.7 cubic metres per second (m3/s)
The river takes its name from a mythical princess named Éirne.
The building of hydroelectric power stations at Cliff (near Belleek) and Ballyshannon (work began in 1945 and the first power station was commissioned in 1950) caused local salmon beats to be flooded. The run of salmon into the Erne has now declined to a level that is of little angling value, except for the few fish that are occasionally caught below Cliff when the power station is generating. Roach first appeared in the river in 1963, and there was an increase in the roach population in 1968. This increase could well have had an adverse effect on trout stocks, which went into decline at that time.[original research?] Water pollution became a problem in the 1970s and up to 1987. Since 1987 the pollution problem has been controlled, the roach population has also declined and trout stocks have made a return and provide good angling once more, both on the Erne itself and its tributaries.
Live aboard pleasure cruisers are available in several locations along the Erne waterway, including Belturbet, Knockniny, Carrybridge, Bellanaleck, Enniskillen, and Killadeas. In addition to the use of the Erne for live aboard boating holidays, sections of the river are used for water skiing, bank fishing, trolling, jet skiing and scuba diving. Boaters are cautioned, by the Northern Ireland Tourist Board, that Upper Lough Erne is a maze of small islands needing careful navigation, and waves on Lower Lough Erne can reach "open-sea dimensions".
The Erne waterway is home to ancient ruins, both Christian and Pagan, with ruins found in several locations, including: Crom Estate, on the North bank of the Upper Erne channel, Gad Island, near Crom Estate, Devenish Island, Inismacsaint Island, Davy’s Island, White Island, and Boa Island. Many of these locations can only be reached by boat.
Devenish Island has a historical display centre adjacent to its ruins. Visitors sometimes use rental boats and the Ordnance Survey of Northern Ireland Activity Map of Lough Erne (ISBN 978-1-905306-26-8) to locate these ancient sites.
Former railway lines
-  Explanatory Memoir, sheets 68 and 69 of the Geological Survey of Ireland,1878
- Notes on River Basins: Page 67
- "Fisheries - River Erne". Ireland Fly Fishing. Archived from the original on 13 July 2011. Retrieved 28 February 2009.
- South Eastern River Basin District Management System. Page 38 Archived 2016-03-03 at the Wayback Machine.
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