The Vale of Tempe (Greek: Tέμπη, Témpi) is a gorge in northern Thessaly, Greece, located between Olympus to the north and Ossa to the south. The valley is 10 kilometres long and as narrow as 25 metres in places, with cliffs nearly 500 metres high, and through it flows the Pineios River on its way to the Aegean Sea. In ancient times, it was celebrated by Greek poets as a favorite haunt of Apollo and the Muses.