Allans Beach proper is approximately long and faces south-southeast; it is part of the Allans Beach Recreation Reserve. It runs to the southwestern tip of the spit which narrows the opening of Hoopers Inlet to a channel some across. Behind the beach rises a system of dunes covered in pīkao sedge. Behind these dunes lies Hoopers Inlet Swamp, which consists of a sequence of wetland types from freshwater swamp to salt marsh. The Allans Beach Wildlife Management Reserve covers a section of the Inlet beyond these wetlands. Northeastward the land rises towards Mount Charles; eastward along the coast the slopes of the Mount abut the sea to form the rugged headlands of Mātakitaki and Cape Saunders. On the far side of the channel the next peak is Sandymount. Periodically, natural processes cause sediments to block the channel entirely, most recently in 2012. The surf at Allans Beach is generally stronger than at beaches closer to the city; in winter the swells coming from the Southern Ocean can be huge.
Wildlife
Allans Beach is frequented by New Zealand fur seals, New Zealandsea lions, and yellow-eyed penguins. The public are urged to keep at least away from these animals, and from active sea lions. Visitors encountering yellow-eyed penguins are asked to crouch down so as not to disturb them. In addition, Hoopers Inlet and the wetlands on the northern side of the Allans Beach spit host a diverse range of estuarine biota. Sharks may be encountered offshore. Despite the aforementioned precautions, some recreational users of Allans Beach have been observed harassing the wildlife. The yellow-eyed penguins' nearest nesting colony is on the Sandymount side of the Hoopers Inlet channel; during the periodic natural blockages of the channel it becomes accessible to foot traffic from the beach, thus exposing the colony to interference by humans and dogs.
Recreational use
Allans Beach sees relatively few visitors. Access is via a walking track across farmland from the end of Allans Beach Road. This track continues for the entire length of the beach and is used for walking, jogging, and wildlife observation. The low elevation of the terrain renders it suitable for trampers of all skill levels. Dogs may be walked on a leash at the western end of the beach but are not permitted at the eastern end, to protect the wildlife. Horses are not permitted on Allans Beach as the area is deemed ecologically sensitive. The frequently high swells can make Allans Beach dangerous for swimmers and challenging for surfers. At least an intermediate level of surfing skill is recommended except on particularly calm days. Owing to Allans Beach's secluded situation, it is favoured by naturists. New Zealand has no official nude beaches, as public nudity is legal on any beach where it is "known to occur".
