It is one of the 81 cities located in the Marmara Region, which has the highest population density in Turkey. It is the largest city in Turkey in terms of population density. It is also one of the leading cities in terms of economy, history and socio-cultural aspects. Istanbul is ranked 34th in the world in terms of economy. It ranks first in Europe and sixth in the world, according to the list of provinces according to population, in the ranking made according to municipal boundaries. Moreover, the geopolitical importance of Istanbul is very high. It is very close to both the Marmara Sea, the Black Sea and the Aegean Sea. (Source: Wikipedia)