Lake Koroneia is a lake in the heart of the Thessaloniki regional unit in the Mygdonian basin in Greece. It is also known as Lake Agios Vasileios after the village Agios Vasileios and as Lake Langadas after the town Langadas, and is located about 14 kilometres east of Thessaloniki city centre. The A2 motorway passes along the north side of the lake, and the old Greek National Road 2 passes along the south side. The lake is shared by the municipalities Langadas and Volvi.