Snowdon is 1,085 metres above sea level — the highest mountain in the UK south of the Scottish Highlands. Glaslyn and Llyn Llydaw lie to the east of the summit and are enclosed by two steep and craggy rock faces —Crib Goch to the north and Bwlchysaethau to the south. These features are shown more graphically in Figure 1.
Glaslyn is an example of a corrie lake. A corrie is a deep, armchair-shaped hollow high in the mountains. Corries begin to form when snow accumulates in a hollow on the mountainside. The snow is compacted and turns into ice. As more and more ice accumulates it starts to move due to the pull of gravity (see Figure 2).
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