Lake Koroneia (Greek: Λίμνη Κορώνεια) is a lake in the heart of the Thessaloniki regional unit in the Mygdonian basin in Greece. The lake is also known as Lake Agios Vasileios after the village Agios Vasileios and as Lake Langadas after the town Langadas. It is located about 14 kilometres east of Thessaloniki city centre. The motorway Egnatia Odos passes along the north side of the lake, and the old Greek National Road 2 passes along the south side.