 In addition to the Singers, the Isle of Echoes houses a number of orderlies, patients visiting the Isle for treatment, and several non-Singer villages, the largest of which is called Harbourtown, in which the main trade is fishing.The waters around the Isle are infested with merlee, and although the Singers are viewed with superstition by many mainlanders, there is a strong trade link with Silvertown based upon the Singer's therapies.The Echorium is the collective name for the complex of bluestone buildings in which the Singers live.