GUA KELAWAR
Located near a tributary in the heart of Kilim mangrove swamps within the Kisap Forest Reserve, the cave is named after the thousands of insect-eating bats clinging to the ceiling of its main chamber. The cave is 60m in length and has two separate caves to explore.
 
Within the cave there are many interesting features and structures commonly found in a tropical cave, including stalactites, stalagmites, flowstones and other formations. However there are old oyster shells encrusted onto the cave walls, which have been dated to be about 5,000 years old, suggesting that sea levels within the region have lowered within that time.


Source:https://langkawigeopark.com.my/cave/