Saint Petersburg (Russian: Санкт-Петербу́рг, Sankt-Peterburg) is a city and a federal subject of Russia located on the Neva River at the head of the Gulf of Finland on the Baltic Sea. The city's other names were Petrograd. The city's other names were (Петрогра́д, 1914–1924) and Leningrad (Ленингра́д, 1924–1991). It is often called just Petersburg (Петербу́рг) and is informally known as Piter (Пи́тер). Founded by Tsar Peter I of Russia on May 27, 1703, it was the capital of the Russian Empire for more than two hundred years (1713–1728, 1732–1918). Saint Petersburg ceased being the capital in 1918 after the Russian Revolution of 1917. It is Russia's second largest and Europe's fourth largest city (by city limit) after Moscow, London and Paris. The city has 4.6 million inhabitants, and over 6 million people live in its vicinity. Saint Petersburg is a major European cultural center, and an important Russian port on the Baltic Sea.

Saint Petersburg is often described as the most Western European styled city of Russia. Among cities of the world with over one million people, Saint Petersburg is the northernmost. The Historic Centre of Saint Petersburg and Related Groups of Monuments constitute a UNESCO World Heritage Site. Russia's political and cultural center for 200 years, the city is sometimes referred to in Russia as the northern capital. A large number of foreign consulates, international corporations, banks and other businesses are located in Saint Petersburg.

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