Bearasaigh lies north west of Great Bernera, Little Bernera and Flodaigh (flat island) and south of Seanna Chnoc (old hill). Although steep-sided the isle has a relatively flat summit. Immediately to the west is Stac an Tùill and there is a sea cave to the north east. The deep sea channel between Bearasaigh and Seanna Chnoc is said to be troublesome when the wind opposes the tidal current.