Te Whanganui-A-Hei (Cathedral Cove) Marine Reserve is on the Coromandel Peninsula in New Zealand covering an area of 840 hectares (2,100 acres).
Cathedral Cove is named after the cave located there, linking Mare's Leg Cove to Cathedral Cove. Gemstone Bay and Stingray Bay are also located within the reserve. A walking track exists from the northern end of Hahei Beach, and it is also possible to walk from the local authority car park at the top of the headland between Hahei and Gemstone Bay. The area is very popular with tourists, and receives around 150,000 visitors a year.