'Anahulu Cave

Lia found ‘Anahulu Cave on a torn map some guesthouse owner in Nuku’alofa had scribbled directions on, and I remember being skeptical — Tonga is all ocean and reef in my head, not caves. But we drove out toward Haveluliku on the eastern side of Tongatapu, maybe twenty-five minutes past the last roundabout where the road narrows and the bush closes in, and the woman collecting the entrance fee at a little wooden stand just pointed us down a dirt path like it was the most normal thing in the world to swim underground on a Tuesday morning.

The walkway drops you into the limestone almost immediately, and the temperature change is the first thing I noticed — that cool, mineral air that cave-goers everywhere seem to describe the same way, except here it’s mixed with the smell of fresh water instead of salt. Guide ropes run along the passage for about 400 meters, though it doesn’t feel that long when you’re distracted by stalactites hanging low enough to touch. I kept ducking even when I didn’t need to.

The pool itself is what people come for, and it earns it. It’s fed by a natural spring, artificially lit in a way that turns the water an almost electric turquoise against the dark rock, and Lia was in before I’d even taken my shoes off. I floated on my back for a long while, looking up at formations that had been dripping into shape for longer than either of us could really picture, and thought about how strange it is that this is Tonga’s only freshwater cave — one pocket of fresh water on an island otherwise ringed by ocean.

We paid our fee, got a little history from the woman at the entrance about where the name comes from — ‘ana for cave, paired with Hulu — and left with wet hair and sandy feet, already talking about lunch back toward Nuku’alofa. It’s a small, humble kind of wonder, the sort of place that doesn’t try to sell itself hard, which is exactly why I liked it.

When to go: Aim for Tonga’s dry season, from May through October, and get there in the morning if you can — the humidity is kinder and the pool sits calmer before the day’s visitors stir it up.