Caer Euni [Grid reference SJ 00027 41266] is an Iron Age hillfort, about 2.5 miles (4 km) north-east of the village of Llandderfel and about 5 miles (8 km) north-east of Bala Lake, in Gwynedd, Wales. It is a scheduled monument.^[1]

Quick Facts Location, Coordinates ...

Caer Euni

Shown within Gwynedd
Location	Near Llandderfel, Wales
Coordinates	52°57′35″N 3°29′21″W
OS grid reference	SJ 00027 41266
Type	Hillfort
Length	216 metres (709 ft)
Width	58 metres (190 ft)
Height	365 metres (1,198 ft)
History
Periods	Iron Age

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The fort is situated on a narrow ridge, at height 365 metres (1,198 ft). It is an elongated enclosure, length about 216 metres (709 ft) and width 58 metres (190 ft), orientated north-east to south-west, aligned with the ridge.^[1][2]

There is a rampart enclosing the inner area, with a steep slope to the south-east and ditches and counterscarps elsewhere. The principal entrance is in the north-east. The fort was enlarged: there is a bank, formerly the south-west end, traceable across the interior, and further defences were built to the south-west, notably a large rock-cut ditch and a rampart built with the stone from the ditch.^[1][2]

The sites of about 25 round huts, diameter 15–20 feet (4.6–6.1 m), have been detected, mostly in the later part of the enclosure.^[1][2]

There are some burnt stones in the south-west corner, but this is not thought to be evidence of a connection with the vitrified forts of Scotland.^[1][2]

• Hillforts in Britain
• List of Scheduled prehistoric Monuments in Gwynedd (former Merionethshire)