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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 Agios Vasileios after an homonymous village and as Lake Langada. It is located about 12 kilometres east of downtown Thessaloniki. The motorway Egnatia Odos passes along the north side of the lake, and the old Greek National Road 2 passes along the south side. The municipalities with shores on the lake are Koroneia, Langadas, and Egnatia.
A million years ago, Lake Koroneia along with Lake Volvi and all of the Mygdonian basin was a large lake. Since then, the area of the lake is declining and the distance from neighboring Lake Volvi is becoming larger. In the 1950s, Koroneia was among the lakes of Greece with the biggest fish production. In the 1970s, its area was 45 km² and had a depth of about 5 metres. In the early 2000s, the lake had shrunk to 10 km² with a depth of about 0.5 to 1 metre. In the summer of 2002, the lake had almost dried up.