English is being taught throughout the country but few cities remain the centers of it.
Istanbul, a fascinating city built on two Continents, divided by the Bosphorus Strait. This is one of the greatest cities in the world where you can see a modern western city combined with a traditional eastern city, it's a melting pot of many civilizations and different people.
Also, Istanbul is an international city which attracts business from all over the world. Naturally, that business is conducted in English, making English a desirable language to learn and native English speakers a precious commodity.
Besides Istanbul, living and teaching English in Ankara, the capital of Turkey, and Izmir is equally enjoyable and rewarding. Both of these cities are located further East than Istanbul which allows the rest of Turkey to be explored easily. It gives easy access to the wonderful coastal parts of Turkey, especially the Aegean and Mediterranean coast where the tourism industry is booming and English is in high demand.