A two-hour hike takes you past limestone caves, primeval vegetation and an underground river. You can trek to the sinkhole's bottom via an ethereal-looking cavern with a hole in its roof. On sunny days at noon, a shaft of light passes through the hole onto the cavern floor.
There's no bus to Chuāntóng Sinkhole, but if you go to Dàshíwēi Sinkhole, the staff can arrange a driver to take you there and back to the city centre for ¥80 to ¥100 a car (seats four).
