Bwrdd Arthur, also known as Din Sylwy, is a 164-metre (538 ft) flat-topped limestone hill on Anglesey's eastern Red Wharf Bay, roughly 3 km northwest of Llangoed [1]. The summit features a stone-walled fort dating to the Iron Age and Roman periods [2]. Designated a Site of Special Scientific Interest for its botanical interest, the site shows evidence of prehistoric occupation [1].
Bwrdd Arthur

| Type | Fortress/citadel |
|---|---|
| Period | 1500 - 500 BC |
| Country | Wales |
| Coordinates | 53.3110° N, 4.1232° W |
Wales