bat cave, a limestone cave near bukit lawang in gunung leuser national park, sumatra, indonesia.

aceh adventure asia attraction bat bats bukit cave caving color colour conservation creepy dark day east ecology environment exploration forest formations fragile geology gunung hiking indonesia jungle landscape lawang leuser limestone medan national nature north outdoors outside park precious protection rainforest rock rocks south stalagmites stalagtites sumatra tourism tourist tramping travel trekking underground walking