Dark and Bright Cave lie in the bordering area between Lan Ha Bay and Ha Long Bay, this area is located in the protected area of Cat Ba Biosphere Reserve. Coming to Dark and Bright Cave, tourists will be indulged in nature with the blue water and fresh air. The best way to admire the majestic foundation of the cave is to go kayaking or row bamboo boats.
Inside Dark and Bright Cave, there are a lot of emulsions and stalactites with different shapes. This is also a safe place for cruises to anchor and provide shelter for fishermen in the rainy season. Adventuring along Dark and Bright Cave, visitors will be overwhelmed by the poetic, lyrical and pristine beauty that Mother Nature has endowed this destination.
Dark Cave and Bright Cave are underwater ones, so the formation of these caves is different from other dry caves. Thus, Dark Cave and Bright Cave possess outstanding and distinguishing beauty. In the process of geological activities in Halong Bay, there are three types of caves which were formed by the impact of water on the karst topography. They are the ancient underground cave, Carxto cave, and frog's jaw cave. Dark Cave and Bright Cave are frog's jaw caves, while the cave floor is under the sea, the cave ceiling is beyond the water. With the unique topography and tectonics, the caves are only accessible by boat.