Bala Lake Railway
Narrow-gauge railway · Llangywer
Castrum
Caer Gai (also Caer-gai) is a Grade II listed Roman fort in the district of Penllyn, Gwynedd, Wales, UK. It is located about 1 mile or 1.6 km north of the village of Llanuwchllyn, and the same distance west of Llyn Tegid (Lake Bala).