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Llyn y Fan Fawr
Llyn y Fan Fawr (Welsh: 'lake of the big peak') is a natural lake in the county of Powys, Wales. It lies at the foot of Fan Brycheiniog, the highest peak of the Black Mountain (Y Mynydd Du) range within the Brecon Beacons National Park (Parc Cenedlaethol Bannau Brycheiniog). The lake is one of the largest glacial lakes in southern Wales and is roughly rectangular in shape with its long axis oriented roughly north-south.
==Drainage==
The lake is enclosed within a rock hollow formed as a result of glacial action during the ice ages, especially the last ice age. There are moraines on the open side of the lake left by the ice, and they have helped to dam the water of the lake. It is drained by a stream known as Nant y Llyn (Welsh: 'stream of the lake'), whose waters flow into the River Tawe. The surface of Llyn y Fan Fawr lies at about 1815 feet or 605 m above sea level.〔Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'〕 Much of the land around the Lake is peaty and thus wet underfoot.
Llyn y Fan Fach (Welsh: 'lake of the small peak') which lies about 2 miles (or 3 km) to the west is of similar origin and slightly smaller in size; it lies about 100 m lower. It was dammed with a small increase in height of the lake in the 1930s to provide water for Llanelly.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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