also known as Nam Tong Island (南堂島) is an island located off the tip of the Clear Water Bay Peninsula in the New Territories of Hong Kong. It is also referred by Hong Kong people as Tung Lung To or Tung Lung Island (東龍島). The island is largely uninhabited. Administratively, it belongs to Sai Kung District.
Emperor Duanzong of the Southern Song Dynasty once stayed at Kwu Tap (古塔) on the island
https://en.wikipedia.org/wiki/Tung_Lung_Chau
