This view eastwards from the peak of Mt Snowdon shows the surrounding glaciated landscape, including Glaslyn and Llyn Llydaw.The map on the back page shows the location of these two lakes just west of Snowdon's peak.
Both Glaslyn and Llyn Llydaw are examples of corrie lakes, although in Wales a corrie is usually called a cwm. These have formed because of glacial erosion, in deep, armchairshaped hollows in the mountainside, which were once the starting point for glaciers (see Figure 1). Today the lakes are fed by mountain streams draining the surrounding high land.
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