A. Kazan is incorporated as the city of republic significance of Kazan.
c. By the results of geological and hydrological researches nearby thousand years ago Bolaq was a natural river. But Volga came some kilometers to the west.
d. Kazan is one of the largest industrial and financial centers of Russia, and a leading city of the Volga economic region in construction and accumulated investment. Total banking capital of Kazan banks is third in Russia.