The cave near Tam Coc Ninh Binh is more than 1500m long with a system of stalactites in various shapes. This is a wet cave or a water cave through the mountain in the Nham valley a way Tam Coc Ninh Binh 6 km. Over millions of years of natural creation, this place also handed down a story about a petrified mermaid. Stalactites in the heart of the cave are like fine art paintings of nature. In the journey to visit Mermaid Cave, visitors can walk on a corridor made of bamboo rafts to penetrate into the heart of the cave.