The main islands are separated by Apsley Strait, which connects Saint Asaph Bay in the north and Shoal Bay in the south, and is between 550 metres and 5 km wide, 62 km long.
As illas principais están separadas polo estreito de Apsley, que conecta a Saint Asaph Bay no norte e Shoal Bay no sur e ten entre 550 metros e 5 Km de ancho por 62 km de longo.