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Lansdowne Reef (Filipino: Bahura ng Pagkakaisa); Len Đao Reef (Vietnamese: Đá Len Đao); Mandarin Chinese: 琼礁; pinyin: Qióng jiāo, is a cay on the southern part of the Union Banks of the Spratly Islands in the South China Sea. The island has been occupied by Vietnam since 1988. It is also claimed by China (PRC), the Philippines, Vietnam, and Taiwan (ROC).

Chigua Jiao (Johnson South Reef)

Đá Cô Lin
(Collins Reef,
Johnson North Reef)

Sinh Tồn (Sin Cowe Island)

Dōngmén Jiāo (Hughes Reef)

Sinh Tồn Đông (Grierson Reef/ Sin Cowe East Island)

Đá Len Đao (Landsdowne Reef)

References

^ (in Vietnamese)Mai Thanh Hai (May 29, 2018). "Những người giữ Len Đao". Thanh Niên. Retrieved December 27, 2022.
^ D. J. Hancox; John Robert Victor Prescott (1995). A Geographical Description of the Spratly Islands and an Account of Hydrographic Surveys Amongst Those Islands. IBRU. pp. 11–. ISBN 978-1-897643-18-1.
^ "Lansdowne Reef". cil.nus.edu.sg. Retrieved 27 December 2022.

Confrontations

Regions

Occupied features

Brunei	Louisa Reef
China	Cuarteron Reef Fiery Cross Reef Gaven Reefs Hughes Reef Johnson South Reef Mischief Reef Subi Reef
Malaysia	Ardasier Reef Dallas Reef Erica Reef Investigator Shoal Mariveles Reef Swallow Reef
Philippines	Commodore Reef Flat Island Irving Reef Lankiam Cay Loaita Cay Loaita Island Nanshan Island Northeast Cay Second Thomas Shoal Thitu Island West York Island
Taiwan	Taiping Island Zhongzhou Reef
Vietnam	Alison Reef Amboyna Cay Barque Canada Reef Bombay Castle Central London Reef Collins Reef Cornwallis South Reef Discovery Great Reef East London Reef Grierson Reef Ladd Reef Lansdowne Reef Namyit Island Pearson Reef Petley Reef Sand Cay Sin Cowe Island South Reef Southwest Cay Spratly Island Tennent Reef West London Reef

Unoccupied features

Amphitrite Group	Rocky Island Tree Island West Sand Woody Island Qilian Yu
Crescent Group	Money Island Robert Island Yagong Island
Other features	Bombay Reef Triton Island

Northeastern SCS

NW	North Danger Reef Northeast Cay Southwest Cay Thitu Reefs Thitu Island Subi Reef Loaita Bank Lankiam Cay Loaita Cay Loaita Island Tizard Bank Gaven Reefs Namyit Island Sand Cay Taiping Island Zhongzhou Reef NNW Irving Reef West York Island WNW Western Reef
NE	Flat Island Nanshan Island Reed Tablemount Third Thomas Shoal
SE	Commodore Reef First Thomas Shoal Mischief Reef Sabina Shoal Second Thomas Shoal
SW	Union Banks Collins Reef Hughes Reef Johnson South Reef Sin Cowe Island Ardasier Reef Cornwallis South Reef Dallas Reef Erica Reef Investigator Shoal Mariveles Reef