| Llyn Llyffant | |
| Pushpin Map: | Wales Conwy |
| Location: | near to Carnedd Llewelyn, Conwy County Borough, Wales |
| Coords: | 53.1619°N -3.9636°W |
| Basin Countries: | United Kingdom |
Llyn Llyffant is the highest lake in Wales, (although in reality the size of a large pond), located at grid reference SH 687 645.[1] Its name translates into English as "frog lake". It lies at an elevation of approximately 815m above sea level.