High Island or Leung Shuen Wan Chau is a former island located in the southeast of Sai Kung Peninsula in Hong Kong, within Sai Kung District. Two sets of dams constructed between 1969 and 1979 and crossing the former Kwun Mun Channel, connect the island to the peninsula, thereby forming the High Island Reservoir. Before being connected to the maiā¦High Island or Leung Shuen Wan Chau is a former island located in the southeast of Sai Kung Peninsula in Hong Kong, within Sai Kung District. Two sets of dams constructed between 1969 and 1979 and crossing the former Kwun Mun Channel, connect the island to the peninsula, thereby forming the High Island Reservoir. Before being connected to the mainland, the island had an area of 8.511 km² and was the 4th largest island of Hong Kong in 1960.