Cau Cave

Cau Cave (Hang Cau) is a natural sea cave at the foot of Thoi Loi Mountain in An Hai Commune, Ly Son Island, Quang Ngai Province. Formed by ancient volcanic activity and sea erosion, it features dramatic basalt cliffs, large rock arches and a rocky beach. Located on the northeast coast of Ly Son, it is notable for its volcanic geology, scenic coastal setting and views of the East Sea, making it a key natural attraction on the island.

Visitors can expect a large natural sea cave beneath steep basalt cliffs at the base of Thoi Loi Mountain, opening onto a rocky and sandy shoreline. The site features volcanic rock formations, eroded arches, boulders and clear sea water. Areas to explore include the cave interior, the beachfront and viewpoints along the cliff base. The surroundings are open and coastal with views of the sea and mountain slopes, suitable for sightseeing, photography and beach walking.

Formed by volcanic activity of Thoi Loi Mountain and subsequent marine erosion over thousands of years; the basalt cliffs and cave illustrate Ly Son's volcanic origins and have long served as a natural shelter for local fishermen

A well-known natural landmark of Ly Son Island representing its volcanic island landscape and coastal fishing culture; valued as a scenic and recreational site for visitors and local community