Tre'r Ceiri hillfort
fort · 800 BC – 100 AD
Tre'r Ceiri is an Iron Age hillfort located in Wales atop the easternmost summit of Yr Eifl, a mountain located on the north coast of the Llŷn peninsula in Gwynedd, northwestern Wales.

- Coordinates
- 52.97455, -4.42391
- Dating
- attested
Sources
- Pleiades: A Gazetteer of Past Places · CC BY 3.0Pleiades: A Gazetteer of Past Places (CC BY 3.0)
- Wikidata · CC0 1.0Wikidata (CC0)