| Clearwater Cave System | |
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Interior of the Clearwater Cave
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| Location | Gunung Mulu National Park, Sarawak[1] |
| Coordinates | 04°03′54″N 114°49′53″E / 4.06500°N 114.83139°E / 4.06500; 114.83139 |
| Length | 255.934 km (159.030 mi)[1] |
| Height variation | 553.41 m (1,815.6 ft)[1] |
| Discovery | See list
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| Difficulty | Advanced - connection to Wind Cave[3] Intermediate - access to underground river[4] |
| Access | Public (Clearwater cave),[5] Restricted (underground rivers and connections)[4][3] |
| Show cave opened | 1985[6] |
| Features | Top 10 longest cave passage in the world[1] |
| Website | Official website Mulu Caves Project website |
The Clearwater Cave System (Malay: Gua Air Jernih) in Gunung Mulu National Park, Sarawak, Malaysia is believed to be one of the world's largest interconnected cave systems by volume and its 9th longest at 236.796 km (147.138 mi) (2020).[7][8][9] The system lies mainly under the western margins of Gunung Api between the Melinau Gorge and Cave of the Winds.
The first exploration by speleologists was during the 1977/78 Royal Geographical Society Mulu Sarawak Expedition when 24 km (15 mi) of the cave passage were surveyed. Many expeditions have increased the explored length and will continue to do so for the foreseeable future.
Gill.D.W.1999. World Heritage Nomination, Gunung Mulu National Park, Sarawak, Malaysia. Forest Department Sarawak.
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Physical geography of Sarawak
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| Coastal features |
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| Interior and water features |
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