The Absheron Peninsula is a peninsula in Azerbaijan. It is host to Baku, the biggest and the most populous city of the country, and also the Baku metropolitan area, with its satellite cities Sumgayit and Khyrdalan. There are three districts, of which two are urban (Baku and Sumgayit), and one, is the suburban district in Absheron region. It extends 37 miles (60 km) eastward into the Caspian Sea, and reaches a maximum width of 19 miles (30 km).