Things to do
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Phong Nha-Ke Bang National Park
Two nights here give you three kinds of cave: one you enter by boat, one you walk through on a boardwalk, and wild ones reached only with a guide. Son Doong, the largest, is a separate expedition booked well over a year ahead.
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Son Doong Cave
Ho Khanh, a local man, came on the entrance in 1991, lost it, and relocated it only in 2008; a British survey the following year measured the biggest cave passage known. Two collapsed skylights let jungle grow underground. Access is a four-day expedition run by one licensed operator, on a capped number of permits, and the route closes when the rains arrive.
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Dark Cave
A zip line runs four hundred metres across the Chay River to the entrance, which sets the tone: the visit is done wet, by headlamp, wading and swimming. A passage narrows to a chamber of thick grey mud deep enough to float in, with a cold rinse afterwards. Kayaks cover the return. The circuit takes around three hours from the zip line platform.
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Hang En
Swiftlets nest in a chamber wide enough to hold a village street, with three entrances and a ceiling well over a hundred metres up. Trips are two days: a forest walk and river crossings to Ban Doong hamlet, then a night camped on a sand beach inside, beside a green pool. Bookings go through licensed operators and the trek closes in flood season.
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Paradise Cave
Found by a local resident in 2005 and surveyed by British cavers, the passage runs thirty-one kilometres into the hillside, of which a lit wooden boardwalk covers the first kilometre. Chambers reach seventy metres overhead. A climb of several hundred steps from the car park comes first, and the air inside holds near eighteen degrees, which is a shock after the walk up.
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Phong Nha Cave
Wooden boats leave the jetty in the village and motor upstream on the Son River before cutting their engines at a low arch and rowing into the mountain. The visitor route covers the first fifteen hundred metres of a cave that runs far deeper, past lit formations and a sandbank where passengers walk back to the water. The round trip from the boat station takes about two hours.
