The battle took place in the valley between the mountains of Belasitsa and Ograzhden near the modern Bulgarian village of Klyuch.
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The Battle of Kleidion (or Clidium, after the medieval name of the village of Klyuch, "(the) key"; also known as the Battle of Belasitsa) took place on July 29, 1014 between the Bulgarian Empire and the Byzantine Empire.
It is located north of Belasitsa, northeast of the Macedonian town of Strumica and northwest of the Bulgarian town of Petrich.