Seal Skerry, a rocky drying reef, extends 0.5 mile NW from the Point of Sinsoss. Between Dennis Head and the Point of Sinsoss, shoals fringe the coast and extend up to 0.3 mile offshore. Brides Ness (59°21'N., 2°24'W.), the SE point of North Ronaldsay, is a low and shelving point. It is fronted by a shoal bank which extends 0.4 mile offshore.

Location