Glengesh Pass February 8, 2018 / tomgallen / Glengesh Pass The Glengesh Pass is a scenic section of the road between Glencolmcille and Ardara in County Donegal. Glengesh means “Glen of the Swans” in Irish. The high pass through Glengesh and Mulmosog mountains is at 900 feet. Glengesh Pass Glengesh Pass