How Did Halong Bay's Limestone Karsts Form Over 500 Million Years?

💡 The Answer

• The karsts formed from ancient coral reefs and marine sediments deposited in warm tropical seas.
• Over millions of years, tectonic uplift raised the seabed, exposing limestone to erosion.
• Dissolution by rainwater and groundwater carved the distinctive tower-and-cave landscapes.
• The process continues today, with erosion slowly reshaping the bay's iconic islets.