Caer Gai
Llanuwchllyn, United Kingdom
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).
Monument data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).