Which dramatic limestone arch formation in the Oparara Basin of Kahurangi National Park, accessible via a rainforest walk, is one of the most impressive natural arches in the Southern Hemisphere?

• A Oparara Arch ✓
• B Pancake Rocks
• C Cathedral Cove
• D Tunnel Beach

The Oparara Basin in the West Coast's Kahurangi National Park features massive limestone arches, caves, and the habitat of the endangered whio (blue duck), carved over millennia by tannin-stained rivers.