Glen Strathfarrar (Scottish Gaelic: Srath Farair) is a glen in the Highland region of Scotland, near Loch Ness. The Glen is part of the Affric-Beauly hydro-electric power scheme, with a dam at Loch Monar and a 9 km tunnel carrying water to an underground power station at Deanie; a second dam just below Loch Beannacharan feeds a tunnel carrying water to Culligran power station (also underground). The Monar dam at Loch Monar is the largest arch dam in Britain.