Moderate to steep, narrow, high tide beach, with shore parallel, sinuous, low amplitude, evenly spaced sand ridges extending out across the inter- to sub-tidal sand flats.
The ridges are not to be confused with the higher relief (sand) bars on the higher energy beaches. The beach is composed of sand and gravelly sand. The beach is only active at high tide. the exact mode of the formation of the ridges (sometimes called multiple bars) is unknown but it is thought they are active and formed during infrequent periods of higher waves acting across the intertidal ridged zone.
NIWA