The Menai strait seperates Anglessey from the mainland of North Wales and is a proposed Marine Nature Reserve.

Approximately 21,000 years ago, during the ice age, two ice sheets one from the mountains of Snowdonia and one from across the Irish Sea collided somewhere over Anglessey and headed south west along the Menai Strait.

This formed a glacial valley where the strait is now, with rivers flowing out to sea at either end of it.

When sea levels began to rise, around 10,000 years ago, estuaries formed at either end, until eventually they met, and the Menai Strait was formed.

Ref: NWALES001

Date: 01 July 2007

Location: Bangor, Gwynedd (Snowdonia), Wales, United Kingdom

Photographer: © Simon Sait

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