Sai Kung Volcanic Rock Region of the Hong Kong UNESCO Global Geopark is a unique region of imposing rich geo-diversity of volcanic rocks. This famous Region includes the magnificent sea stacks on Bluff Island, the breathtaking wave abrasion landforms and sea caves on Wang Chau, the typical sea stacks, island reefs and wave-cut bays of Basalt Island, rare acidic volcanic hexagonal rock columns of High Island and marks of ancient lava flows on Sharp Island.