The east coast sea cliffs are 'Eua's most dramatic feature. The island's limestone has been lifted and tilted by tectonic forces over millions of years, creating cliffs that drop almost vertically into the ocean from heights of up to 120 metres. The cliff walk along the top is one of the finest coastal walks in Tonga — wide views over the blue Pacific, sea birds wheeling below, and the occasional humpback whale visible in the channel between 'Eua and Tongatapu from June through October.
The path along the cliff edge runs for several kilometres through the national park, with viewpoints at intervals and a few spots where you can sit with your legs dangling over nothing but air and ocean. There are no fences and no guardrails — be sensible about where you step, especially after rain when the limestone becomes slippery.