Novosibirsk is the largest city and administrative centre of Novosibirsk Oblast and the Siberian Federal District in Russia. As of the 2021 Census, it had a population of 1,633,595, making it the most populous city in Siberia and the third-most populous city in Russia. The city is located in southwestern Siberia, on the banks of the Ob River. Novosibirsk is home to numerous Russian corporations, the neo-Byzantine Alexander Nevsky Cathedral, the Novosibirsk Opera and Ballet Theatre, as well as the Novosibirsk Zoo. It is served by Tolmachevo Airport, the busiest airport in Siberia.
