| Ynys Uchaf | |
| Aos: | Carmarthenshire |
| Interest: | Biological |
| Coordinates: | 51.8118°N -4.1937°W |
| Displaymap: | Wales |
| Area: | 15.82 ha |
| Notifydate: | 24 July 1987 |
Ynys Uchaf is a section of floodplain of the River Gwendraeth that is a Site of Special Scientific Interest in Carmarthen & Dinefwr, Wales.