Cornwallis South Reef
| Disputed atoll | |
|---|---|
| Satellite image | |
| Other names | Đá Núi Le (Vietnamese) Nanhua Reef (南华礁) (Chinese) Osmeña Reef (Philippine English) Bahura ng Osmeña (Filipino) | 
| Geography | |
| Location | South China Sea | 
| Coordinates | 8°43′09″N 114°10′55″E / 8.7191081°N 114.1819513°E | 
| Archipelago | Spratly Islands | 
| Administration | |
| District | Trường Sa district | 
| Claimed by | |
Cornwallis South Reef (Vietnamese: Đá Núi Le; Chinese: 南华礁; pinyin: Nanhua Dǎo), also known as Osmeña Reef (Filipino: Bahura ng Osmeña), is a coral atoll reef in the Spratly Islands in the South China Sea. It covers an area of about 10 km by 5 km, and is entirely submerged at high tide.