Lake Kournas is actually the only large natural lake in Crete and is located 20km west of Rethymnon.The lake is small and circular and covers an area of 579 acres, has maximum depth 22.5 m, maximum length 1080m and maximum width of 880m.

The volume of water in summer is approximately 7.5 million cubic meters. There are many traditional taverns in Georgioupoli (2.5 km south of the lake) with high quality of cretan food, and many other shops to eat or drink something.