Thebes was in which geographic area?

Thebes was in the Balkan Peninsula.

Explanation:

The city if Thebes, which is in today's date known as Thiva was situated in the Balkan Peninsula which is made by mainland Greece extending into the Mediterranean Sea. Thebes was the main political center of ancient Greece which was destroyed in the invasion of the Macedonian emperor Alexander the Great in 335 BC. On his mission to conquer the world, Thebes was one of the most important cities that Alexander got hold of because the one who had control over Thebes could rule over entire Greece.

C. naturally in the environment