Ephesus was one of the largest Ionian cities in Anatolia, at the mouth of the Caistro River on the coast of present-day Turkey. The city was located in present-day Turkey approximately between the cities of Smyrna and Aydın. It was an important and rich commercial center and from 129 BC. it was the capital of the Roman province of Asia. Among the ruins, which make it one of the best known archaeological sites in the Mediterranean Sea, those of the Theater, the small temple of Hadrian, the Library of Celsus and the numerous public baths are worthy of note.