The Keyhole Natural Tunnel is a natural tourist attraction located at Marine Parade South in Piha, holding a 5.0 Google rating.
Exploring coastal geological features along Auckland's rugged west coast requires an eye on the elements. Coastal tunnels, blowholes, and sea caves are shaped by heavy surf, meaning safe access almost always depends on low tide and calm sea conditions. Regulars know to check local tide charts carefully before setting out, as surging swells can quickly cut off access paths or wash through rocky gaps. Wearing sturdy footwear with good grip is essential for navigating wet rocks and shifting black sand.
For those heading out to explore the Piha coastline, The Keyhole Natural Tunnel offers a striking stop along the southern shore.