It has no permanent inhabitants; the only house is used as a holiday residence by its owner, Marcus de Ferranti.

It is surrounded by many rocks, especially in Gunna Sound (Scottish Gaelic: Am Bun Dubh[6]), between it and Tiree.

[7] Gunna supports a wide range of sea birds, as well as geese, and shelducks.

[3] Sandy Duncanson, the villain of Neil Munro's novel The New Road, comes from here, one chapter is titled "The Man from Gunna".

It is suggested that this symbolises his ambiguous nature, since Tiree was "one of Mac Cailean Mór's loyal islands", and Coll was wild country.