A hong, or room, is a cave found inside some of the karsts, formed when the middle of the peak collapses into the sea. Though these little oases have become a popular and sometimes crowded sight, it’s still worth venturing in to see these true wonders of nature up close. Narrow access means that the only way in is by sea kayak, which can be hired at one of the floating barges just outside the hong entrance. The caves are a challenge to navigate,