Derbent, formerly romanized as Derbend, is a city in Dagestan, Russia, located on the Caspian Sea. It is the southernmost city in Russia, and it is the second-most important city of Dagestan. Derbent occupies the narrow gateway between the Caspian Sea and the Caucasus Mountains connecting the Eurasian Steppe to the north and the Iranian Plateau to the south; covering an area of 69.63 square kilometres (26.88 sq mi), with a population of roughly 120,000 residents.