17/09/2026
Why does Vietnam have so many limestone islands? The answer goes back more than 500 million years. What is now Halong Bay was once covered by a shallow tropical sea. Over millions of years, layers of limestone were gradually shaped by rain, wind, and shifting seas into the dramatic karst landscape we see today, creating more than 1,600 islands and islets rising from emerald waters.
Experience this extraordinary UNESCO World Heritage Site as part of our Red River & Halong Bay journeys and discover the cruise at https://www.pandaw.com/expeditions/halong-bay-red-river