Lung Kwu Chau (; also previously transliterated as Tung Koo, Tung Koo, Toon Oo or Toon-quoo) is an island at the northwest water of Hong Kong.
The island known as Lung Kwu Chau (; formerly also referred to as Tung Koo, Tung Koo, Toon Oo or Toon-quoo) is situated at the northernwestern edge of Hong Kong.