The fort of Rathmorgan on the mountain at the south west corner of the lake is the site of the Táin Bó Flidhais cattle raid on Erris from Cruachan in Tulsk, Co.
The results of Archaeological Surveys carried out by Prof. John Waddell, from National University of Ireland, Galway, are incorporated into the exhibition rooms at Cruachan Aí Heritage Centre.
On their 2006 album The Morrigan's Call, the Irish Celtic metal band Cruachan featured a song "Ungoliant" as well as one named after Shelob.