Baku (Azerbaijani: Bakı) is the capital and the largest city of Azerbaijan, as well as the largest city on the Caspian Sea and of the Caucasus region. It is on the southern shore of the Apsheron Peninsula. Baku is located 28 metres (92 ft) below sea level, which makes it the lowest lying national capital in the world and also the largest city in the world located below sea level. Modern Baku has three parts: the Old Town (İçəri Şəhər), the boomtown and the Soviet-built town. About 3 million people live in the metropolitan area. There are large numbers of refugees and internally displaced persons.
In Baku area there is a lot of oil. There are a lot of state and private universities.