River Erne
The Erne rises on the east shoulder of Slieve Glah mountain[1] three miles south of Cavan in County Cavan, Republic of Ireland, and flows 80 miles (129 km)[2] through Lough Gowna, Lough Oughter and Upper and Lower Lough Erne, County Fermanagh, Northern Ireland, to the sea at Ballyshannon, County Donegal back in the Republic.Live-aboard pleasure cruisers operate from several locations along the Erne waterway, including Belturbet, Knockniny, Carrybridge, Bellanaleck, Enniskillen, and Killadeas.[citation needed] 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".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.[citation needed] The song Buachaill Ón Éirne is an Irish ballad about a young boy from the Erne area.