The Thracians (; Thrāikes, ) were a group of Indo-European tribes inhabiting a large area in Southeastern Europe. They were bordered by the Scythians to the north, the Celts and the Illyrians to the west, the Ancient Greeks to the south and the Black Sea to the east. They spoke the Thracian language – a scarcely attested branch of the Indo-European language family. The study of Thracians and Thracian culture is known as Thracology.