Po Pin Chau (Chinese: 破邊洲) is an island in Hong Kong. Off the eastern coast of the East Dam of the High Island Reservoir, the island is known for its hexagonal columnar jointing po po pooiong. The island was originally a cape connected to the mainland, but eventually broke away from the mainland due to years of erosion. The island is administered by the Sai Kung District.[1][2][3]