Meghalaya's Underground River Caves Hold a World Record Most Indians Have Never Heard Of

Krem Puri, located in the Siju-Rewak area of South Garo Hills, was mapped by the Meghalaya Adventurers Association and a team of international cavers in 2018 and measured at 24.583 kilometres, making it the longest sandstone cave in the world. Not the longest in India. The longest sandstone cave on the planet. The record was verified and logged, a quiet geological bombshell that received almost no national coverage outside specialist publications.
The cave system sits inside the Meghalaya Plateau, a region geologists sometimes call the "cave capital of the Indian subcontinent" for the sheer density of karst formations beneath its surface. The plateau's limestone and sandstone layers, formed over hundreds of millions of years, have been carved by underground rivers into a network that cavers are still mapping. Krem Puri is the headline, but it is one of over 1,700 documented caves in the state, more than any other region in India.The passages inside Krem Puri shift between tight crawls and cathedral chambers tall enough to lose a four-storey building in. The Simsang River feeds the system, and at points you are wading through active water channels in total darkness except for your headlamp. The rock is dark sandstone, not the pale limestone of tourist caves like Borra in Andhra Pradesh or Belum in the same state. The colour and texture feel different, older, heavier, less decorated with the white stalactites that make for dramatic photographs.
Bats are the dominant fauna. Meghalaya's caves host several species, including the wrinkle-lipped free-tailed bat, which roosts in colonies numbering in the millions in caves like Siju. The cave ecosystem runs on bat guano, insects, spiders, and crustaceans that have adapted to permanent darkness and feed on the organic matter that rains down from the colony above. Some of these invertebrate species are found nowhere else in the world.Krem Liat Prah, also in Meghalaya, held the title of India's longest cave before Krem Puri was fully mapped, and it remains the longest natural cave in South Asia at over 31 kilometres. The two are part of the same broader Siju-Rewak system, and cavers believe the full connected network may be significantly longer than either individual measurement suggests.
Mawsmai Cave near Cherrapunji is the most visited cave in the state and the one most travellers actually reach, a short, lit, tourist-friendly passage through limestone formations. It is worth seeing, but it gives almost no sense of what serious spelunking in Meghalaya involves. Arwah Cave, also near Cherrapunji, is less visited and contains fossilised marine shells in its walls, evidence that this plateau was once submerged under a shallow sea.

For travellers who want something between a tourist cave and an expedition, Mawmluh Cave, one of the four caves that give the Meghalaya Plateau its formal geological name, the Meghalayan Age, is accessible with a guide and offers several hours of exploration without requiring technical gear.Shillong is the base for most Meghalaya cave exploration. Flights connect to Shillong Airport from Kolkata and Guwahati, and the drive from Guwahati takes roughly four hours on a good day. Cherrapunji, which locals call Sohra, is about 55 kilometres from Shillong and serves as the staging point for the limestone cave belt. South Garo Hills, where Krem Puri sits, is a separate journey, about six to seven hours from Shillong by road, and the cave itself requires permission from the Meghalaya Adventurers Association and a certified guide. It is not a drop-in destination.
The Meghalaya Adventurers Association runs guided expeditions and is the right first contact for anyone serious about underground exploration in the state. October to March is the window, the monsoon fills the lower passages with water and makes many sections impassable from June through September. Cherrapunji receives among the highest annual rainfall on earth, and the caves feel that water for months after the rains stop.Meghalaya's cave record does not fit neatly into the categories Indian travel media tends to reach for. It is not a pilgrimage site. It has no Bollywood connection. The photography is difficult, cave interiors demand specialist lighting equipment, and the images that come back from serious expeditions look nothing like the bright, saturated photographs that drive social media travel content. The caves reward people who go looking for them, not people who stumble across them in a reel.

The state government has invested in the living root bridges of Cherrapunji and the clean village of Mawlynnong as tourism anchors, and those are genuinely worth visiting. But the cave system beneath the same hills is a world record that most of the country walks past without knowing it exists.
The record for the world's longest sandstone cave belongs to India. It has belonged to India since 2018. The cave is still there, still being mapped, and the full extent of what runs beneath Meghalaya's hills has not yet been measured.