Natural feature
Hạ Long Bay
Hạ Long Bay
Emerald bay of nearly two thousand limestone karst islands and caves rising from the Gulf of Tonkin.
This guide to Hạ Long Bay in Ha Long traces the two times UNESCO recognized these limestone waters over the twentieth century: first in 1994 for their sheer visual drama, then in 2000 for a geological story stretching back half a billion years of sedimentation and erosion. It leaves open what a third recognition, decades later, would find here that the first two missed.
Audio guides are written and narrated by AI.