Lake Yliki
| Lake Yliki Υλίκη | |
|---|---|
partial view of Lake Yliki, north of Thiva, Greece. | |
| Location | Central Greece |
| Coordinates | 38°24′N 23°16′E / 38.400°N 23.267°E |
| Primary inflows | Cephissus |
| Basin countries | Greece |
| Surface area | 19.1 km2 (7.4 sq mi) |
| Surface elevation | 78 m (256 ft) |
| Islands | 10 |
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Lake Yliki (Greek: Υλίκη Yliki, Ancient Greek: Ὑλίκη Hylike, Latinised as Hylica) is a large natural lake of Boeotia, central Greece. Situated 8 km north of Thebes at 78 m elevation, it has been an important source of drinking water for the Athens agglomeration since 1958. It is surrounded by low mountains, which separate it from the drained Lake Copais.