| Country: | Wales |
| Official Name: | Tre-Castell |
| Coordinates: | 53.2853°N -4.0872°W |
| Cardiff Distance Mi: | 130.4 |
| Cardiff Distance Km: | 209.9 |
| London Distance Mi: | 207.2 |
| London Distance Km: | 333.4 |
| Community Wales: | Beaumaris |
| Unitary Wales: | Anglesey |
| Constituency Welsh Assembly: | Ynys Môn |
| Constituency Westminster: | Ynys Môn |
| Post Town: | Beaumaris |
| Postcode District: | LL58 |
| Os Grid Reference: | SH 6095 7851 |
Tre-Castell is a hamlet in the community of Beaumaris, Anglesey, Wales, which is 130.4 miles (209.9 km) from Cardiff and 207.2 miles (333.4 km) from London.[1]