Sumner Bar is located at the outlet to the Christchurch Estuary where the Avon and Heathcote Rivers flow out to sea. Sumner Bar is a river mouth break on a sandy beach with both right and left-handers on offer. Needs a good swell to get working and requires the right tide. When it's on, it can get really good with barrels on offer, but requires a lot of paddling or a jet ski. Best left to experienced surfers due to the strong currents.