Tham Khao Chang Hai

Tham Khao Chang Hai is a guided limestone cave in Na Yong district, about 25km from Trang town — six connected chambers threaded through a small standalone karst hill, with a concrete walkway and installed lighting the whole way. Entry is 50 THB per person, but you can’t just walk in: visits run on fixed guided rounds, four on weekdays and six on weekends, each lasting about 20 minutes.

Inside, the chambers hold stalactites and stalagmites still actively forming, some fused into columns where drips have met over centuries. The formations are lit for visibility rather than atmosphere — enough to see detail on the rock without needing your own torch, though the deeper corners still fall into shadow. A local guide walks the roughly 500-metre loop with you, pointing out formations and repeating the cave’s founding legend: a royal elephant procession from Nakhon Si Thammarat, travelling to help build a great chedi, stopped here when a pregnant elephant went into labour. The newborn calf wandered off into the cave and was never found again among its uneven floors and stone curtains — hence “Chang Hai,” the elephant that disappeared.

The path underfoot is level and well maintained, so this suits families and casual visitors more than serious cavers — there’s no climbing, crawling, or wading. Because entry is by scheduled round rather than open-door access, groups move together at the guide’s pace rather than exploring freely, which keeps the cave calmer than sites where visitors wander at will.

Insider Tip: Turn up 15 minutes ahead of a round rather than exactly on time — the visitor centre across from the entrance handles ticketing and can get busy right before a scheduled departure, and rounds don’t wait for latecomers.

Watch out: Because it’s tour-round access only, arriving between scheduled times means waiting, sometimes close to an hour on weekdays. Check the round times before setting out from Trang.

Getting there from Trang town takes about 30-40 minutes by car or motorbike along local roads through Na Yong district’s rice-farming countryside — there’s no public transport running directly to the cave, so self-drive or a hired driver is the practical option. The surrounding hill is small enough that you won’t mistake it for one of Trang’s bigger karst formations, but the isolated setting, standing alone in flat farmland rather than part of a longer ridge, is exactly why the elephant legend took hold — a lone hill visible for miles, an obvious place to lose something inside.