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Subi Reef

Disputed island
Sentinel-2 Image (October 2022)
Subi Reef
Other names	Zhubi Reef 渚碧礁 Zhǔbì Jiāo (Chinese) Zamora Reef (Philippine English) Bahura ng Zamora (Filipino) đá Xu Bi (Vietnamese)
Geography
Location	South China Sea
Coordinates	10°54′48″N 114°03′43″E / 10.9133°N 114.062°E / 10.9133; 114.062
Archipelago	Spratly Islands
Area	0 km (0 sq mi) (Natural) 3.95 km (1.53 sq mi) (Reclaimed)
Administration
China
Province	Hainan
prefecture-level city	Sansha
Claimed by
China
Philippines
Taiwan
Vietnam

Subi Reef, also known as Đá Xu Bi (Vietnamese: Đá Xu Bi); Zamora Reef (Filipino: Bahura ng Zamora, lit. 'Reef of Zamora'); Zhubi Reef (Chinese: 渚碧礁; pinyin: Zhǔbì Jiāo), is an atoll in the Spratly Islands of the South China Sea located 26 km (16 mi) southwest of Thitu Island. It is occupied by China, and claimed by the Philippines, Taiwan and Vietnam.

Topography and features

The atoll measures 5.7 kilometres (3.5 mi) along its longer southwest-northeast axis, and is up to 3.5 kilometres (2.2 mi) wide. Its total area including the lagoon and rim of the atoll measures 16 square kilometres (6.2 sq mi), and the lagoon is up to 22 metres (72 ft) deep.

Naturally above water only at low tide, the atoll surrounds a lagoon. The People's Republic of China has constructed a 4-story building, a weather observation station with doppler weather radar, wharfs, and an airport in the area. A buoyed channel guides ships to the inner lagoon which is 3.7 kilometres (2.3 mi) in diameter.

UNCLOS Maritime Ruling

On 12 July 2016, the UNCLOS special arbitral tribunal in the Philippines v. China case confirmed that Subi Reef is, or in its natural condition was, exposed at low tide and submerged at high tide and is, accordingly a low-tide elevation that does not generate entitlement to a territorial sea, exclusive economic zone or continental shelf, but is within 12 miles of a high-tide feature Sandy Cay on the atoll's west of Thitu Island.

As the Subi Reef is under the water, it is considered by the Third United Nations Conference on the Law of the Sea (UNCLOS III) as "sea bed" in "international waters". Although the PRC had ratified a limited UNCLOS III not allowing innocent passage of warships, according to the UNCLOS III, features built on the sea bed cannot have territorial waters.

Environmental issues

The PRC has ratified UNCLOS III; the convention establishes general obligations for safeguarding the marine environment and protecting freedom of scientific research on the high seas, and also creates an innovative legal regime for controlling mineral resource exploitation in deep seabed areas beyond national jurisdiction, through an International Seabed Authority and the Common heritage of mankind principle.

Territorial disputes

The atoll is controlled by China (PRC), with a 2014 estimate of 200 troops stationed there, and also claimed by Taiwan (ROC), Vietnam and the Philippines. In July 2012, a large fleet of 30 Chinese fishing vessels arrived at the atoll from Hainan.

In April 2015, a Philippine Navy aircraft patrolling near the atoll received "aggressive action" from a Chinese ship. Also in 2015, the USS Lassen sailed within 12 nautical miles (which if applicable is the territorial waters limit of the atoll), prompting the Chinese Foreign Ministry to call the action a "provocation" and vowed to keep building up in the South China Sea. As per the US Navy, this was a routine "freedom of navigation" exercise. Similar exercises are performed routinely about 12–28 times per year.

During 2014, the PRC started reclaiming land at Subi Reef, and by the end of 2015 had developed it into an island of 3.95 square kilometres (1.53 sq mi), with a military base, a large harbor, and an airstrip of about 3,000 metres (9,800 ft). In November 2015, two U.S. B-52 strategic bombers flew in airspace near the area. They were contacted by Chinese ground control, but were allowed to continue their mission undeterred. In April 2016 a new lighthouse 55 meters (180') high commenced operations. A civilian test flight to the new airport was conducted by a passenger jet of Hainan Airlines on July 13, 2016.

See also

• Fiery Cross Reef
• Great wall of sand
• Mischief Reef
• Nine-dotted line

References

1. Atoll Area, Depth and Rainfall: Zhubi
2. Anda, Redempto (17 July 2012). "Government told of China buildup 2 months ago". Philippine Inquirer. Retrieved 29 October 2013.
3. Jingya, Mei (19 July 2012). "China installed radar on Zhubi Reef：Philippine media". Sina English News. Retrieved 29 October 2013.
4. "Digital Gazetteer of the Spratly Islands". www.southchinasea.org. Archived from the original on July 17, 2007. Retrieved 2008-03-22.
5. "高清：菲律宾称中国将在南沙渚碧礁建机场". qq.com. Tencent QQ. Retrieved August 9, 2016. Chinese language page with a collection of 10 photos of the reef and Thitu (Pagasa) Island dated 25 July 2012. Pictures 1,3,4&6 show the buildings on the reef; 5 shows a lighthouse, 7–10 show Pagasa
6. "Award". Permanent Court of Arbitration. 12 July 2016. p.174
7. ^ "UNCLOS. Declarations upon ratification".
8. Jennifer Frakes, The Common Heritage of Mankind Principle and the Deep Seabed, Outer Space, and Antarctica: Will Developed and Developing Nations Reach a Compromise? Wisconsin International Law Journal. 2003; 21:409
9. DJ Sta. Ana (June 13, 2014). "China reclaiming land in 5 reefs?". www.abs-cbnnews.com. Retrieved September 11, 2014.
10. Cunfu, Wang (18 July 2012). "Fishing vessels arrive at Zhubi Reef of south China Sea". Xinhua. Archived from the original on July 24, 2012. Retrieved 29 October 2013.
11. "Philippine military says Chinese ship took aggressive action". Gulf News. United Arab Emeritus. Associated Press. 18 April 2015. Retrieved 5 April 2015.
12. Perlez, Jane (2015-10-27). "Beijing Calls U.S. Warship's Route in South China Sea a 'Provocation'". The New York Times. ISSN 0362-4331. Retrieved 2015-10-27.
13. "A U.S. Naval Signal in the South China Sea". Council on Foreign Relations. Retrieved 2015-11-02.
14. Gregory Poling. "Potential New Runway Presents New Headaches". Asia Maritime Transparency Initiative. Retrieved 2015-10-30.
15. "Subi reef tracker". Center for Strategic and International Studies. Archived from the original on 2016-05-15. Retrieved 2016-03-05.
17. Prashanth Parameswaran (2016-04-06). "China Unveils New South China Sea Lighthouse on Subi Reef". The Diplomat. Retrieved 2016-04-24.
18. "China conducts test flights on two new airports on Nansha Islands". Xinhua. Archived from the original on August 22, 2016. Retrieved 2016-07-14.

External links

• Asia Maritime Transparency Initiative Island Tracker
• Maps of Paracels and Spratlys

v t e Spratly Islands
Confrontations	Southwest Cay incident (1975) East Sea Campaign (1975) Johnson South Reef Skirmish (1988)
Regions	Dangerous Ground Loaita Bank London Reefs North Danger Reef Reed Tablemount Tizard Bank Union Banks
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	First Thomas Shoal Half Moon Shoal Luconia Shoals Northeast Investigator Shoal Royal Captain Shoal Sabina Shoal Third Thomas Shoal Western Reef Whitsun Reef
Related articles	Spratly Islands dispute Free Territory of Freedomland "Great Wall of Sand" List of airports in the Spratly Islands List of maritime features in the Spratly Islands Philippines and the Spratly Islands Republic of Morac-Songhrati-Meads Territorial disputes in the South China Sea Nine-dash line

• Atolls of China
• Atolls of the Philippines
• Atolls of Taiwan
• Atolls of Vietnam
• Atolls of the Spratly Islands
• Landforms of Khánh Hòa province
• Artificial islands of Asia
• Disputed atolls
• Coastal fortifications