With a total area at low tide of about 3km2, the geological structure is a rocky island in coastal areas combined with high limestone mountain terrain, but Bach Long Vi island in Hai Phong city has up to 46ha of area. natural forest cover. It is a favorable environment for many migratory animals and birds living on the island. Besides the forest ecosystem on the island, Bach Long Vi also owns a clean, green sea and has a diverse marine ecosystem such as: coral ecosystem, seaweed ecosystem along with hundreds of endemic seafood species. Living around the island are abalone, sea cucumbers or other types of sea snails, sea fish...