The electorate is bounded in the east by the Pacific Ocean and in the north by the Waimakariri River. Since the 2008 election, the western and southern boundary followed Main North Road, Marshland Road, North Parade, Dudley Creek, the Avon River, Keyes Road and Pages Road, before cutting through the Bromley wastewater treatment plant to Cuthberts Road. The boundary then followed Cuthberts Road, Breezes Road and Bridge Street to the Avon River, before following the Avon through the Avon Heathcote Estuary and out to the Pacific Ocean.