This site is relatively unknown amongst the many attractions in Halong Bay. While it is a bit far off, the journey here will be made worth your while as you begin a kayak exploration amidst emerald waters, limestone karsts and intriguing wonders that await within the cave. There are, in fact, two caves here; one of them is the Light Cave which is naturally lit by shafts of sunlight which shine through gaps in the rocks. The Dark Cave, true to its name, offers reduced visibility so artificial light will be needed when here. Both offer fascinating formations and backdrops to take in.