Belnahua lies three miles north of the Grey Dogs, and to get to it requires a little crafty positioning.
Belnahua is a mixture of man-made and natural history.
Here was the slate quarry that carved away the heart of the island, replacing the gold-flecked, steely slate with a pool of aquamarine that is deeper than the island itself.
In times past, Cullipool was also the means of access to the least known and smallest of the Slate Islands, Belnahua, a mile offshore.
The advent of the first world war left the island with no men of working age, and the few remaining residents were evacuated to Luing.
Close to Belnahua in views from Cullipool is the even smaller island of Fladda, home to a lighthouse whose accommodation now forms a private holiday home.
15:30 NE over Belnahua to Seil and the white houses of Easdale.
The ebb tide was by now running strongly between the islands so we did not have time to go out to the Garvellachs and get to Seil by night fall.
17:40 Panorama from Seil, Cuan Sound on the left, Luing, Scarba, Jura, Islay, Fladda (lighthouse), Eilean Dubh Mor, Eilean Dubh Beag, Belnahua, Eileach an Naoimh (the Garvellachs) Dubh-fheith (rock), Mull Easdale island and Easdale village on Seil.
The slate industry has long gone but the islands provide a fascinating glimpse in to the lives of the men and women who lived and worked there.
2) Tony Hill from Seafari Adventures took Mark by boat to Belnahua -- an island which was abandoned after the men left to fight the First World War.
Walking round the island, Mark discovered the homes of the workers and found that everything needed on the island had to be brought in by boat -- from water to topsoil for growing vegetables.
