Sitting at the mouth of Tolo Harbour in Tai Po, Port Island overlooks the southern Tap Mun Island. This uninhabited island may seem lone and barren, but it is the gateway of Tolo Harbour for it guards the strategic pass of Tolo Channel.
As the Chinese name Chek Chau implies, Port Island is a place of red earth. The ground on the entire island is rust-coloured conglomerate and siltstone. From Wong Chuk Kok Hoi to Hung Shek Mun, past Tsat Shue Wan, Cheung Tsui to Hung Pai, it is a grandiose domain of red peaks, rusty soil, red earth and green trees. This extraordinary scene is known as “Danxia Wonder at Sea”.