Llyn Llywenan (English: Yew Tree Lake) is a lake in western Anglesey, Wales found just over 1 kilometre (0.6 mi) north of the village of Bodedern and 9 kilometres (5.6 mi) east of the town of Holyhead. At a maximum length of 1.1 kilometres (0.7 mi) and breath of 0.4 kilometres (0.2 mi) it has a surface area of only 0.4 square kilometres (0.2 sq mi).