Mulu Cave, The most under-mention wonders in the world

The oldest of Mulu's caves started to form about 5 million years ago when sideways earth movements resulted in the formation of both limestone and sandstone mountains, lying side by side. Millions of years of heavy rain and the action of rivers and running water carved out the vast subterranean system that exists today. The weathering process still continues; dripping water creates new rock features, limestone is slowly worn away, and underground rivers carve and sculpt the caves, transporting limestone debris to the cave mouth or redistributing it within the system.

Although Mulu is synonymous with caves, the 'Mulu experience' is not limited to underground attractions; above ground there is plenty to see and do. The park is covered in rich primary rainforest and offers a whole range of nature-based activities. There are some excellent jungle treks and mountain hikes, including the challenging trek to view the Pinnacles - 45 metre high, razor sharp limestone spikes that sit majestically on the slopes of Gunung Api

Within Gunung Mulu National Park is the world's biggest natural enclosed space - Sarawak chamber, found in Gua Nasib Bagus. It is 2,300 feet (700 m) long, 1,300 feet (396 m) wide and at least 230 feet (70 m) high; according to the guides it is big enough to fit St. Peter's Basilica, the area is bigger than  20 football fields or even few stadiums and 40 jumbo aeroplane inside. Other notable caves are Benarat Cavern, Deer Cave, Wind Cave, and Clearwater Cave, which exposes parts of a long underground river going through the park.

Clearwater Cave is a short 10-minute walk through the jungle to Cave of the Winds, and is one of the longest caves in the world, currently measured at 140km, but they are discovering more of the cave every year.

The Clearwater River runs for at least 108km of this cave. It was really cool to see the force and power of the subterranean river carving its path through the limestone rock in the cave. Legend has it that if you wash your face in the crystal clear waters of the river within the cave, you will be granted youth; of course we had to do that and we feel younger already!

Langs Cave was named after its discoverer, and it was full of the most amazing stalactites (these grow down), stalagmites (these grow up) and helictites (these grow sideways against gravity). Our guides had a fun time checking our imagination and seeing what different creatures and shapes we saw in the different "mites". Apparently it takes approximately 50-100 years for 10mm of a "mite" to be formed and so you can imagine the age of the formations in these caves.

Deer Cave is houses over 3 million bats, several different species. This is not the most impressive thing about this cave, however. The sheer size of the cave is spectacular, whereby in contrast to the other caves it has the largest cave entrance and passage in the world. You can fit over five St. Paul Cathedrals in this cave's main chamber! It truly was colossal and a most magnificent natural phenomenon, and we were blown away as we thought Niah Cave was impossible to beat. With millions of bats living in this cave, the smell of guano was quite strong and over-powering, and as we walked to higher elevations the smell seemed to get stronger. Browse through the photo album for this entry to see some of the weird and creepy creatures living in the dark in this cave.

The Wonders you discover in Borneo is the world's greatest remaining natural resource, is the most powerful and bioactively diverse natural phenomenon on the planet

The pinnacles in Mulu national park of the Borneo Virgin Forest. It’s a home of 4 million bats of several species, and about 6 p.m.daily they all fly out for their nightly hunting. Mulu is delightfully free of mosquitoes, and people say the bats are to be thanked for that. They came out first in small clouds, like puffs of smoke made up of whirling black specks. Their individual movement appeared erratic, but as a pack they moved in concert, flying over our heads and out of sight behind the trees. They kept coming until we could no longer see any separation between the groups, and now the column of bats moved like chimney smoke on a day with just a little wind, snaking left and right but not breaking. They did not spread out across the sky but clustered together in a band, and they kept coming for an extraordinarily long time, until it became easy to believe there are 4 million of them.

It's more than a 3 km walk along a wide boardwalk through rainforest from the park headquarters to Lang's Cave and the Deer Cave (so called because local people used to corner deer there and kill them for meat). Lang's Cave has beautiful limestone formations. The Deer Cave is impressive for its immense size and the slime of bat guano throughout.

At the end of the Deer Cave, you're treated to a view of the outside world that they call the Garden of Eden.

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