Menai Strait
General data
- Name: Menai Strait
- Water system: Irish Sea
- Water type: Strait
- Progression: Irish Sea -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: Europe
- Countries: Wales (UK)
The Menai Strait is a strait which separates the island of Anglesey from Gwynedd, on the mainland of Wales. It is situated between Caernarfon Bay in the south-west and Conwy Bay in the north-east, which are both inlets of the Irish Sea. The strait is about 25 km (16 mi) long and varies in width from 400 metres (1,300 ft) between Fort Belan and Abermenai Point to 7.5 kilometres (4.7 mi) between Puffin Island (Ynys Seiriol) and Penmaenmawr. It contains several islands, including Church Island (Ynys Tysilio), on which is located St Tysilio's Church.