Afon Eigiau is a small

river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...

in the

Carneddau The (lit. 'the cairns'; is a Welsh language, Welsh plural form, and is sometimes anglicised to ''Carnedds'') are a group of mountains in Snowdonia, Wales. They include the largest contiguous areas of high ground (over or high) in England and W ...

mountains in

Snowdonia Snowdonia, or Eryri (), is a mountainous region and National parks of the United Kingdom, national park in North Wales. It contains all 15 mountains in Wales Welsh 3000s, over 3000 feet high, including the country's highest, Snowdon (), which i ...

, in north-west

Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...

, which flows down Cwm Eigiau and into

Llyn Eigiau Llyn Eigiau is a lake on the edge of the Carneddau range of mountains in Snowdonia, Conwy, Wales. The name ''Eigiau'' is thought to refer to the shoals of fish which once lived here. Early maps refer to it as ''Llynyga''. It is thought that ...

. It is fed by smaller streams which flow down the slopes of neighbouring

Foel Grach Foel Grach is a mountain in the Carneddau range. It is the eighth-highest summit in Snowdonia as well as Wales, and is included in the Welsh 3000s. It is located on a broad ridge extending northwards from Carnedd Llewelyn to Carnedd Gwenllia ...

, Carnedd Llywelyn and

Pen yr Helgi Du is a mountain peak in the eastern part of the Carneddau in Snowdonia, North Wales. It lies on the south-eastern flanks of Carnedd Llewelyn, and is linked to Carnedd Llewelyn over the col of Bwlch Eryl Farchog, a knife-edge ridge over the cliff ...

References

Caerhun Dolgarrog Rivers of Conwy County Borough Rivers of Snowdonia {{Wales-river-stub