Baku - the capital of the Republic of Azerbaijan, the largest industrial, economic, scientific and technological center of the Caucasus, as well as the largest port on the Caspian Sea and the largest city in the Caucasus. Baku agglomeration area is 2150 km2. Baku is located on the southern shore of the Absheron Peninsula. City on its antiquity, size and population is one of the oldest and largest cities in the East. With a population of Apsheron Peninsula population agglomeration is 2 673. 7 thousand. Residents. Baku awarded the 2010 United Nations Environment Programme (UNEP) the title of one of the major cities for the World Environment Day. These cities are elected annually. In 2010, along with the capital of Azerbaijan, these titles are also awarded to Genoa (Italy) and Geneva (Switzerland).