Type Natural Ribbon Lake Basin countries United Kingdom Average depth 3 m (9.8 ft) Outflow location River Dysynni | Primary outflows River Dysynni Surface area 220 acres (89 ha) Area 89 ha | |
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Similar Cadair Idris, Talyllyn Railway, Dolgoch Falls, Dolgoch railway station, Nant Gwernol railway st | ||
Tal-y-llyn Lake, also known as Talyllyn Lake, Llyn Mwyngil or Llyn Myngul is a large glacial ribbon lake in Gwynedd, North Wales. It is formed by a post-glacial massive landslip damming up the lake within the glaciated valley.
Contents
Map of Llyn Mwyngil, Tywyn, UK
GeographyEdit
Tal-y-llyn Lake is situated to the north of Machynlleth, at the foot of Cadair Idris, in the Snowdonia mountain range of Gwynedd, Wales. The River Dysynni flows from the lake, through the village of Abergynolwyn, and discharges into the sea north of Tywyn.
There is a route leading to the summit of Cadair Idris from near the lake and the narrow gauge Talyllyn Railway has its eastern terminus at nearby Abergynolwyn, within the parish of Tal-y-llyn, the hamlet at the southern end of the lake.
GeologyEdit
The Tal-y-llyn Lake is located on a major fault line in Wales known as the Bala Fault, which extends from the Cheshire border to Towyn on the Cardigan Bay coast. The depression caused by this was likely carved out and deepened during subsequent glaciation periods. Until 1962, Tal-y-llyn Lake was regarded as the most southerly example of a lake formed in a rock basin, with a terminal moraine on top of the bedrock through which the river had carved a channel. It is now understood that what appeared to be bedrock is in fact massive blocks of debris left by a large landslide. An enormous scar on the valley side to the left of the foot of the lake shows the source of the landslide, and another landslide a few miles downstream caused the River Dysynni to divert into the adjoining valley to the north. The upper end of the lake is becoming shallower as a result of the deposition of alluvium.
In fictionEdit
1976 Newbury Medal winner Susan Cooper used the lake as a setting for the book The Grey King. Within the lake six sleepers lie, wakened by Will Stanton playing the Harp of Gold. Afterward, they ride to the aid of the Light in the book Silver on the Tree.