2. The background information

As we know Cheung Chau is a tomobolo. It is located between the Lantau island and Lamma island, which is a small island 10 km southwest of Hong Kong Island. There are one wave-cut platform, one sea cliff and one stack, located in the Nam Tan Wan in Cheung Chau.(refer to attactment 1).

For Ping Chau, it lies in Mirs Bay, in northeastern Hong Kong. This island is named for the most popular of Hong Kong’s four best-known natural sights. This island is made of sedimentary rocks. Its name means “Flat Island”. There are many coastal landforms, such as wave-cut platforms, sea cliffs and stacks. In addiction, there are also sea caves and sandy beaches. The wave-cut platforms is located in the Kang Lau Shek(更樓石), and there are two sea stacks measuring 7-8m standing on the wave-cut platform. The sea cliffs are at Lan Kwo Shui (難過水), which are connected with the formation of a wave-cut platform. For sea stacks, they are located in the Kang Lau Shek and Chum Kang Chau(斬頸洲. For the map of Ping Chau and the location of the coastal landforms,  see attachment 2.