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India's longest cave systems — labyrinths dissolved out of ancient limestone by the world's heaviest monsoon rain.

Meghalaya holds India’s longest cave systems — among them Krem Liat Prah in the Jaintia Hills, surveyed to more than 30 km of passages. These are karst caves: tunnels dissolved out of thick beds of Cretaceous–Eocene limestone by faintly acidic rainwater working along cracks and bedding planes over hundreds of thousands of years.

What makes this corner of India a caving superpower is simply rain. The Khasi and Jaintia Hills take the monsoon head-on — Mawsynram and Cherrapunji are among the wettest inhabited places on Earth — and all that water pouring through soluble rock keeps carving an underground world that cavers are still mapping today.

Sources

• Meghalaya Adventurers Association — speleological surveys
• Geological Survey of India

A short reference note: this summary draws on third-party sources such as the Geological Survey of India and Wikipedia. In time I plan to give every geological feature its own learning-oriented write-up — with custom diagrams, graphs, and study pointers — as I’ve already done for the 11 locations that have an Instagram reel.