Swan Cave

Swan Cave is an underground stream cave inside Khao Nan National Park, in Tambon Krung Ching, Nopphitam district. Unlike a typical walk-in cave, a park ranger has to guide every visit — call the park office in advance, ideally about a week ahead, so staff can schedule someone to take you.

The route follows the stream for roughly 300 metres, past stalactites and stalagmites shaped by the water over time, to a second-tier waterfall that’s the main destination. Getting there involves ducking under low sections, crawling through tight spots, and climbing over wet rock — this isn’t a stroll on a boardwalk. A colony of bats lives in the cave but reportedly keeps clear of visitors rather than causing any trouble. Because the whole route runs along an active stream, park staff often restrict or cancel trips during the rainy season when flash-flood risk rises.

Watch out: this cave is not the free, casual walk-in some listings describe. It sits inside a national park with its own gate fee, and access depends entirely on a ranger being available to guide you — turning up unannounced is likely to mean a wasted trip.

Insider Tip: Wear a head-mounted headlamp rather than carrying a torch, since you’ll need both hands free for the climbing sections, and leave phones and wallets in the car — the wading stretches make dropped valuables a real risk, not a theoretical one.

Krung Ching Waterfall, the park’s better-known highlight, is in the same subdistrict and makes a natural add-on if you’re already arranging a park visit. Visit Nakhon Si Thammarat for the rest of the province.