This from Wikipedia: Tanygrisiau is a village and area within Blaenau Ffestiniog in the upper end of the Vale of Ffestiniog in the county of Gwynedd, north-west Wales (52°59′12″N 3°57′25″W). It can be found along the southern side of the Moelwyn mountain range and dates to around 1750. Tanygrisiau, or more properly 'Tan y grisiau', is Welsh for "below the steps", referring to the stepped cliffs above the village. Tanygrisiau was famous for its slate mining, producing a high quality black slate that was used across the world. Tanygrisiau railway station is on the Ffestiniog Railway, a narrow gauge railway built to carry slate from the mines down to the sea at Porthmadog where it was shipped all around the world, mostly for use in roofing. The nearby Ffestiniog power station, the high Stwlan Dam and Llyn Ystradau colloquially known as Tanygrisiau Reservoir, are part of a pumped storage hydroelectricity installation. Much nearer the railway station is a waterfall on the Afon Cwmorthin and below the falls, and powered by a different water source, is a very small hydro-electric power station.

Llyn Ystradau or Tan y grisiau (Welsh for "below the steps) reservoir with the Moelwyns, a mountain range in Central Snowdonia), behind.

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