Te Whanganui-A-Hei (Cathedral Cove) Marine Reserve is in the southern part of Mercury Bay on the Coromandel Peninsula in New Zealand covering an area of 840 hectares (2,100 acres).

With attractions such as a natural rock archway and neighbouring beaches at Cathedral Cove, the area is very popular with tourists, and receives around 150,000 visitors per year.

[3] In January 2024, the Department of Conservation said they were "not confident" the track would reopen due to significant damage to the stability of the ground in the area.

According to tradition, Hei chose the area around Mercury Bay as home for his tribe, proclaiming ownership by calling Motueka Island "Te Kuraetanga-o-taku-Ihu" (the outward curve of my nose).

[8] The cove was used as one of the locations in the music video for the song "Can't Hold Us" (2011) by Macklemore and Ryan Lewis featuring Ray Dalton.