The most fascinating feature of this compelling coastline is a series of remarkable interlocking sea caves, between 30 and 50 metres in height, some cut back into the cliffs for over 100 metres. They were named by Dr Hocken's group in 1892, "as being appropriate from their ^-shaped roofs and their reverberating qualities". Dr Hocken recorded "full test being made by whistling, singing, and coo-eeing". 

Coal seams may be seen in the cave entrances. The caves can be visited only from one hour before low tide to one hour after. Care must be taken at all times, as the occasional freak wave has drenched more than one visiting group. 38 km. On Waipati Beach. Turnoff signposted at 36 km SW of Owaka on Highway 92. Tide times are usually posted at the start of the access road. 20 mins walk down a steep track from the end of the access road. A powerful torch is essential if one is to venture any distance into the system.