Glaciation has left hundreds of lakes across Eryri, each with its own character. From the copper-green tarn beneath the Snowdon summit to the vast ribbon of Llyn Tegid, these are detailed guides to the most significant.
Glaslyn
The high mountain lake directly beneath the summit of Yr Wyddfa, with its extraordinary copper-green colour from dissolved minerals and the ruins of Britannia Copper Mine on its shore.
Llyn Idwal
Wales' first National Nature Reserve. Darwin visited in 1842. Idwal Slabs above, arctic-alpine plants on the cliffs, the dark slot of the Devil's Kitchen. One of the great short walks in Eryri.
Llyn Tegid
The largest natural lake in Wales: 6km long, 42m deep, home to the gwyniad — a fish found nowhere else on earth. Bala Lake Railway runs along its southern shore.
Llynnau Mymbyr
The twin lakes at Capel Curig produce the most famous view in Snowdonia: Yr Wyddfa reflected in still water. A calendar photograph waiting to happen.
Llyn Padarn
The lake beside Llanberis, shaped by the slate industry. Dolbadarn Castle on its eastern sill, the Lake Railway along its shore, arctic char in its depths.
Llyn Gwynant
The most beautiful valley lake in Eryri, stretching through Nantgwynant beneath the wooded slopes of Moel Siabod. Wild swimming, the Watkin Path start, and the finest valley drive in Wales.