The parish is bordered on the east by Castletown and Santon Burn; on the north by the Granite Mountain and the South Barrule; by an irregular line from the South Barrule to Poyll Vaaish on the west; and by the sea on the south. It contains about . Most of the parish is low and undulating, forming much of the southern plain of the island. The northern portion is more hilly, including the South Barrule, the highest point of the south of the island at . The Silver Burn river rises near the South Barrule and flows under the Monks Bridge at Ballasalla, reaching the sea at Castletown harbour.