Baku is the capital and largest city of Azerbaijan, located on the Absheron Peninsula on the Caspian Sea. Baku has over 2 million residents and is divided into 11 districts and 48 townships, including some built on islands in the Baku Bay and oil platforms in the Caspian Sea. The Inner City of Baku is a UNESCO World Heritage site. The manat is the currency of Azerbaijan, divided into 100 qəpik. Tourism is an important growing part of Azerbaijan's economy, recovering since the 2000s after being damaged during the Nagorno-Karabakh war in the 1990s.