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First Thomas Shoal, also known as Bulig Shoal in the Philippines, Bãi Suối Ngà in Vietnam, and 信义礁 in China, is an uninhabited reef/atoll located 29 nautical miles (54 km; 33 mi) south of Second Thomas Shoal in the Spratly Islands of the South China Sea.

The shoal is one of three named after Thomas Gilbert, captain of the Charlotte:

First Thomas Shoal	09°19′N 115°56′E / 9.317°N 115.933°E / 9.317; 115.933, South of the Second Thomas Shoal.
Second Thomas Shoal	09°44′N 115°52′E / 9.733°N 115.867°E / 9.733; 115.867, South East of Mischief Reef.
Third Thomas Shoal	10°54′N 115°56′E / 10.900°N 115.933°E / 10.900; 115.933, North East of Flat Island - some distance North of the Second Thomas Shoal.

References

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