All rights reserved by the author

31 October 2026

Deep within the rainforests of Sarawak, on the Malaysian side of Borneo, lies a landscape that seems almost beyond imagination. Gunung Mulu National Park is known for its limestone formations, forested mountains and an extraordinary network of underground chambers and passages.

The park contains at least 295 kilometres of explored caves. Among its most remarkable features is the Sarawak Chamber, an enormous underground space measuring approximately 600 metres long, 415 metres wide and 80 metres high. Its scale is difficult to comprehend without standing inside it.

The caves are not merely geological attractions. They provide shelter for millions of bats and swiftlets, while the surrounding rainforest supports an exceptional variety of plants and wildlife. Scientists also study the cave systems to understand geological change and the evolution of underground life.

More than 90 per cent of the park and most of its caves remain closed to ordinary visitors, helping protect sensitive natural environments.

Recognised as a UNESCO World Heritage Site in 2000, Gunung Mulu demonstrates how much of the natural world remains hidden beneath familiar landscapes.

Above ground, the rainforest appears immense. Beneath it, another world has been taking shape over millions of years.

#Malaysia #Borneo #NaturalHeritage #RajatChandraSarmah

Rajat Chandra Sarmah, Guwahati, Assam, India, Instagram @rajatchandrasarmah, YouTube: conversewithasmile, email rajatchandrasarmah@gmail.com