From PathfinderWiki

Dunrock is one of the two islands that make up the Keelwrack district of the Chelish city of Vyre. Dunrock is infamous for housing one of the most notorious prisons in all Avistan, the hellish Dunrock Prison. The island was named in honour of its sadistic discoverer, but is smaller than the neighbouring Keelwrack Island. It is separated from the rest of Vyre by the shallow and aptly named Keelwrack Harbor.1