Second Thomas Shoal
| Disputed atoll | |
|---|---|
| Second Thomas Shoal | |
| Other names | Ayungin Shoal (Philippine English) Bãi Cỏ Mây (Vietnamese) Buhanginan ng Ayungin (Filipino) Rén'ài Jiāo 仁爱礁/仁愛礁 (Chinese) | 
| Geography | |
| Location | South China Sea | 
| Coordinates | 9°44′N 115°52′E / 9.733°N 115.867°E | 
| Archipelago | Spratly Islands | 
| Administration | |
| Region | Southwestern Tagalog Region | 
| Province | Palawan | 
| Municipality | Kalayaan | 
| Claimed by | |
Second Thomas Shoal, also known as Ayungin Shoal (Filipino: Buhanginan ng Ayungin, lit. 'sandbank of silver perch'), Bãi Cỏ Mây (Vietnamese) and Rén'ài Jiāo (Chinese: 仁爱礁/仁愛礁), is a submerged reef in the Spratly Islands of the South China Sea, 105 nautical miles (194 km; 121 mi) west of Palawan, Philippines. It is a disputed territory and claimed by multiple nations.
The reef is occupied by a garrison of Philippine Navy personnel aboard a ship, the BRP Sierra Madre, that was intentionally grounded on the reef in 1999 and has been periodically replenished since then.