Pak Chau or Tree Island is an island at the northwest water of Hong Kong. It is offshore of Lung Kwu Tan near Tuen Mun in the New Territories.

Conservation

Since 1996, the island, Lung Kwu Chau, and Sha Chau are within the boundaries of the Sha Chau and Lung Kwu Chau Marine Park. The three islands have been listed as a Site of Special Scientific Interest since 1979. It is known as a dolphin sanctuary and a habitat for the Chinese white dolphin.