The Theater and Sunken Ruins at Apollonia in Cyrenaica (Libya)

Apollonia in Cyrenaica was founded by Greek colonists and became a significant commercial centre in the southern Mediterranean. It served as the harbour of Cyrene, to the southwest. The city is the birthplace of the Greek geographer and mathematician Eratosthenes.

Apollonia was one of the five towns of the Libyan Pentapolis. The early foundation levels of the city of Apollonia are below sea level due to submergence in earthquakes, specifically the Crete earthquake and tsunami of July 21st in 365 AD. The theater is outside the city walls and is well preserved.

The ruins of Apollonia are sited by the modern town of Susa in Libya.