Lake Yliki Υλίκη
partial view of Lake Yliki, north of Thiva, Greece.
Lake Yliki Υλίκη
Location	Central Greece
Coordinates	38°24′N 23°16′E / 38.400°N 23.267°E / 38.400; 23.267
Primary inflows	Cephissus
Basin countries	Greece
Surface area	19.1 km2 (7.4 sq mi)
Surface elevation	78 m (256 ft)
Islands	10

Lake Yliki (Greek: Υλίκη Yliki, Ancient Greek: Ὑλίκη Hylike, Latinised as Hylica^[1]) 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.^[2] It is surrounded by low mountains, which separate it from the drained Lake Copais.

Wildlife

The lake is home to several threatened endemic or near-endemic fish species:^[3] (IUCN Red List status shown)

• Yliki barbel (Barbus carottae) formerly classified as skarouni (Luciobarbus graecus)
• Greek stickleback or ellinopygósteos (Pungitius hellenicus)
• marathon minnow (Pelasgus marathonicus)
• Beotian riffle dace or paskóviza (Telestes beoticus)
• Greek rudd or kalamithra (Scardinius graecus)
• Yliki roach (Leucos ylikiensis)

In popular culture

Some scenes of French-singer Indila's music video "S.O.S" were filmed at the lake.^[4]