Clearwater Cave is Asia's longest cave, measuring some 107 km. It has a subterranean river, part of which is navigable by boat. There are two ways of reaching Clearwater. Firstly, you can trek along a 4 km nature trail which takes approximately one and half hours. Alternatively, you can travel by longboat along the Melinau River, usually stopping off at Wind Cave along the way. It normally takes about 15 minutes to reach Wind Cave by boat. When the water level is low the journey takes longer as the boatman often has to jump out of the boat and push.

A plankwalk leads from the riverbank to the entrance of Wind Cave, so named because of the cool breezes which can be felt at the narrow parts of the cave. Wind Cave, which is part of the Clearwater Cave system, has many impressive stalactites, stalagmites, flowrocks, helitites and rock corals, some of which are illuminated in the 'King's Room.'

From Wind Cave you can either follow a plankwalk or take a boat to a picnic area near the entrance of Clearwater Cave. Either way the journey takes about 5 minutes. 200 steps lead up through the forest to the mouth of Clearwater Cave. With its underground river, Clearwater is a fascinating cave to stroll around. Plankwalks, paths and small floating bridges make this an easy and enjoyable experience. There are excellent photo opportunities for those who have the patience for cave photography.