Long Chau Island belongs to Cat Hai District, Hai Phong City, is the most remote island cluster of the Cat Ba archipelago (more than 50km from the mainland). At the same time, this is also the outpost in the southeast of the Gulf of Tonkin, with the task of protecting maritime border security as well as guiding ships in and out of the Gulf of Tonkin when there is a lighthouse built on the island in 1999. 1894 (129 years old) with a lighting range of more than 27 nautical miles. Long Chau island cluster consists of 22 islands and rocks creating a unique natural complex at sea, both for security defense and as a place for ships to take shelter from unexpected storms at sea. In particular, the Long Chau island cluster is formed by limestone, so there is no natural fresh water on the island. Accordingly, the flora is also less developed, so viewed from above, the island cluster looks like brave warriors guarding the sea. homeland sky.