Llyn Alwen
| Llyn Alwen | |
|---|---|
|  Llyn Alwen | |
|   Llyn Alwen | |
| Location | Mynydd Hiraethog, Conwy County Borough, Wales | 
| Coordinates | 53°05′41″N 3°38′51″W / 53.0947°N 3.6474°W | 
| Type | lake | 
Llyn Alwen is a small natural upland lake on Mynydd Hiraethog in Conwy County Borough, Wales at SH 898 565. It lies on the rolling Silurian moorland to the north-west of Mwdwl-eithin and about 10 km to the east of Betws y Coed. The discharge from the lake flows under the A543 road to form the headwater of Alwen Reservoir. The area was used as a special stage during the 2015 Wales Rally GB.