Kat O

Pak Ka Chau (Chinese: 筆架洲) is an islet of the North District of Hong Kong. It is located within Double Haven, south of Kat O.

Yan Chau (印洲) is an islet in the North District in the New Territories of Hong Kong. It is located within Double Haven.

Crooked Harbour or Kat O Hoi (Chinese: 吉澳海) is a harbour at the northeast of New Territories, Hong Kong. The harbour is connected to Double Haven and the bigger sea of Mirs Bay. Crooked Island, also known as Kat O, and several islands, including Ap Chau, form the harbour with the mainland New Territories.

Double Haven or Yan Chau Tong (Chinese: 印洲塘) is a harbour enclosed by Double Island, Crescent Island and Crooked Island within the north-eastern New Territories of Hong Kong. It is known for its scenery and natural environment, and for the calm seas from which its English name derives. Double Haven contains many deep red coloured rocks because of iron oxide.

Sai Lau Kong (Chinese: 西流江) is a village in the Sha Tau Kok area of North District of Hong Kong.

Ap Tau Pai (Chinese: 鴨兜排) is a small island between Yan Chau Tong and Crooked Harbour in the north-eastern New Territories of Hong Kong. It is located in Ap Chau Bay (鴨洲海), North-east of Hong Kong. It is under the administration of North District.

Crescent Island or Ngo Mei Chau (Chinese: 娥眉洲) is an island of Hong Kong, located southeast of Crooked Island (Kat O) and northeast of Double Island (Wong Wan Chau). Administratively, it is part of North District.

Ngau Shi Wu (Chinese: 牛屎湖; lit. 'cow turd lake') is a village in the North District of Hong Kong.

Ap Chau (Chinese: 鴨洲; lit. 'duck island'), also known as Robinson Island, with a size of 0.04 km² is an island in the Crooked Harbour, in the north-eastern New Territories of Hong Kong. It is located in Ap Chau Bay (鴨洲海; Ap Chau Hoi). Islets located close by include Ap Chau Pak Tun Pai, Ap Chau Mei Pak Tun Pai, Ap Lo Chun, Ap Tan Pai and Kau Tau Shek. Ap Chau is considered as the smallest inhabited island in Hong Kong.

Double Island or Wong Wan Chau (Chinese: 往灣洲) is an island located in the north-eastern part of Hong Kong. Administratively, it is part of North District.

Ap Tan Pai (Chinese: 鴨蛋排) is a reef in the New Territories of Hong Kong. It is located in Ap Chau Bay (鴨洲海; Ap Chau Hoi) of Crooked Harbour, between Ap Chau (鴨洲) to the east and Ap Lo Chun (鴨籮春) to the southwest. It is under the administration of North District.

Round Island or Pak Sha Chau (Chinese: 白沙洲; pinyin: Báishā Zhōu) is an uninhabited island of Hong Kong. Administratively, it is part of the North District.