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| Llyn Eigiau | |
|---|---|
 from the summit of Clogwynyreryr | |
  Llyn Eigiau | |
| Location | Snowdonia, Gwynedd, Wales |
| Coordinates | 53°10′8″N 3°54′57″W / 53.16889°N 3.91583°W |
| Type | natural, reservoir |
| Primary inflows | Afon Eigiau |
| Primary outflows | Afon Porth-llwyd |
| Basin countries | United Kingdom |
| Surface area | 120 acres (49 ha) |
| Max. depth | 32 ft (9.8 m) |
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 a small number of Arctic char exist in the lake (as they do in neighbouring Llyn Cowlyd) after they were transferred here from Llyn Peris, and certainly it is one of the few lakes in Wales to have its own natural brown trout. The lake is surrounded by mountains including Pen Llithrig y Wrach.