Baku (or Bakı in Azerbaijani) is the capital and largest city of Azerbaijan, as well as the largest city on the Caspian Sea and of the Caucasus region. Baku is located 92 feet (28 meters) 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. Baku lies on the southern shore of the Absheron Peninsula, alongside the Bay of Baku. At the beginning of 2009, Baku's urban population was estimated at just over two million people. Officially, about 25 percent of all inhabitants of the country live in Baku's metropolitan area. Baku is the sole metropolis in Azerbaijan.
Baku is divided into twelve administrative raions and 48 townships. Among these are the townships on the islands of the Baku Archipelago, and the town of Oil Rocks built on stilts in the Caspian Sea, 37 miles (60 kilometers) away from Baku. The Inner City of Baku, along with the Shirvanshah's Palace and the Maiden Tower, were inscribed as a UNESCO World Heritage Site in 2000.
The city is renowned for its harsh winds, which is reflected in its nickname, the "City of Winds."
Information from:
en.wikipedia.org/wiki/Baku 