Baku 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 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. It is located on the southern shore of the Absheron Peninsula, alongside the Bay of Baku.Baku is the sole metropolis in Azerbaijan.
Baku has a temperate semi-arid climate with hot and humid summers, cool and occasionally wet winters, and strong winds all year long. Baku and the Absheron Peninsula on which it is situated, is the most arid part of Azerbaijan (precipitation here is around or less than 200 mm (8 in) a year). The majority of the light annual precipitation occurs in seasons other than summer, but none of these seasons are particularly wet.