This large megalithic tomb about 130 feet in length has twin galleries with one covered by a large capstone. It is oriented east to west, with the main entrance located on the eastern end. At mid-day in midwinter the sun rides along a ridge of the mountains to the south and shines directly into the second chamber. This site is located north of Dun Alt Fort close to Malin More, Glencolmcille (Irish: Gleann Cholm Cille) off the R263road in County Donegal (Irish: Contae Dhún na nGall).