Yan Chau () is an islet in the North District in the

New Territories The New Territories (N.T., Traditional Chinese characters, Chinese: ) is one of the three areas of Hong Kong, alongside Hong Kong Island and Kowloon. It makes up 86.2% of Hong Kong's territory, and contains around half of the population of H ...

Hong Kong Hong Kong)., Legally Hong Kong, China in international treaties and organizations. is a special administrative region of China. With 7.5 million residents in a territory, Hong Kong is the fourth most densely populated region in the wor ...

. It is located within

Double Haven Double Haven or Yan Chau Tong () 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 ...

Conservation

Yan Chau is part of the

Double Haven Special Area Double Haven or Yan Chau Tong () is a harbour enclosed by Wong Wan Chau, Double Island, Crescent Island, Hong Kong, Crescent Island and Kat O, Crooked Island within the north-eastern New Territories of Hong Kong. It is known for its scenery and ...

() that covers and was designated in 2011. The special area includes the islets Pak Ka Chau, Yan Chau (both within Double Haven) as well as the islet of

Ap Lo Chun Ap Lo Chun () is a small island in the New Territories of Hong Kong. It is under the administration of North District. Location Ap Lo Chun is located in Ap Chau Bay (; Ap Chau Hoi) of Crooked Harbour, between Ap Chau () in the east and Sai A ...

and a part of

Ap Chau Ap Chau (), 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 (; Ap Chau Hoi). Islets located close by include ...

(both within

Crooked Harbour Crooked Harbour or Kat O Hoi () 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, for ...

). The geology of the area is characterised by

sedimentary rock Sedimentary rocks are types of rock (geology), rock formed by the cementation (geology), cementation of sediments—i.e. particles made of minerals (geological detritus) or organic matter (biological detritus)—that have been accumulated or de ...

s of the

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...

and

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

periods.

References

North District, Hong Kong Uninhabited islands of Hong Kong {{NewTerritories-geo-stub