The Cathedral of Christ the Saviour is a Russian Orthodox cathedral in Moscow, Russia, on the northern bank of the Moskva River, a few hundred metres southwest of the Kremlin. With an overall height of 103 metres (338 ft), it is the third tallest Orthodox Christian church building in the world, after the People's Salvation Cathedral in Bucharest, Romania and Saints Peter and Paul Cathedral in Saint Petersburg, Russia.

Moscow is the capital and largest city of Russia. The city stands on the Moskva River in Central Russia, with a population estimated at over 13 million residents within the city limits, over 18.8 million residents in the urban area, and over 21.5 million residents in its metropolitan area. The city covers an area of 2,511 square kilometers (970 sq mi), while the urban area covers 5,891 square kilometers (2,275 sq mi), and the metropolitan area covers over 26,000 square kilometers (10,000 sq mi). Moscow is among the world's largest cities, being the most populous city in its entirety in Europe, the largest urban and metropolitan area in Europe, and the largest city by land area on the European continent.