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Kazan is the largest city and capital of Tatarstan, Russia. The city lies at the confluence of the Volga and the Kazanka Rivers, covering an area of 425.3 square kilometres (164.2 square miles), with a population of over 1.3 million residents, and up to nearly 2 million residents in the greater metropolitan area. Kazan is the fifth-largest city in Russia, being the most populous city on the Volga, as well as within the Volga Federal District.

Historically, Kazan was the capital of the Khanate of Kazan, and was conquered by Ivan the Terrible in the 16th century, at which point the city became a part of the Tsardom of Russia. The city was seized (and largely destroyed) during Pugachev's Rebellion (1773–1775), but was later rebuilt during the reign of Catherine the Great. In the following centuries, Kazan grew to become a major industrial, cultural and religious centre of Russia. In 1920, after the Russian SFSR became a part of the Soviet Union, Kazan became the capital of the Tatar Autonomous Soviet Socialist Republic (Tatar ASSR). Following the dissolution of the Soviet Union, Kazan remained the capital of the Republic of Tatarstan.

Kazan is renowned for its vibrant mix of Tatar and Russian cultures. In 2023, 4 million tourists visited Kazan, and Kazan Kremlin, a World Heritage Site, recorded more than 4.5 million visits. In April 2009, the Russian Patent Office granted Kazan the right to refer to itself as the "Third Capital of Russia". In 2009, Kazan was chosen as the "sports capital of Russia". Kazan hosted the 2013 Summer Universiade, and was one of the host cities of the 2018 FIFA World Cup. Kazan hosted the BRICS Games from 12–23 June 2024. Athletes competed in 27 sports.