Located 9 km west of Cam Pha, Quang Hanh Grotto is the longest grotto in Halong Bay. It is 1,300 m long, and stretches throughout the stone mountain of Quang Hanh. The French named it “Le Tunnel,” or Tunnel Grotto.
Quang Hanh Grotto is accessible by either boat or car, but the entrance only appears when the tide is out. Ba Co Shrine (shrine of three girls) is in the grotto beside a smooth stone block.
To get there, tourists can hire canoes in Ðoan wharf (Hòn Gai, Hạ Long City) or take a coach to Cẩm Phả. At the Cẩm Phả wharf, one can also hire boats or canoes to go to the
grotto. One should visit the grotto at low tide, as this is the time the mouth of the grotto appears. Remember to bring along torches before starting the journey. It takes one some 60 to 90 minutes to complete the trip. Hanh Grotto seems suitable to adventures. Another matter of no less important is that the boatmen must be experienced or else you will get locked up in this deep “Water Palace”.
Legend tells that three girls, who were once journeying on the sea, came to the grotto to take shelter from the rain. They were so engrossed with the beauty of the grotto, that they did not notice the rising tide. They drowned, only to become water goddesses.
Quang Hanh Grotto is extremely beautiful. A small boat will take you through the stone passageway by flashlight, casting magical colors on the hanging stalactites.