Geography

The area of Saint Petersburg city proper is 605.8 square kilometers (233.9 sq mi). The area of the federal subject is 1,439 square kilometers (556 sq mi), which contains Saint Petersburg proper (consisting of eighty-one municipal okrugs), nine municipal towns – (Kolpino, Krasnoye Selo, Kronstadt, Lomonosov, Pavlovsk, Petergof, Pushkin, Sestroretsk, Zelenogorsk) – and twenty-one municipal settlements.

Petersburg is situated on the middle taiga lowlands along the shores of the Neva Bay of the Gulf of Finland, and islands of the river delta. The largest are Vasilyevsky Island (besides the artificial island between Obvodny canal and Fontanka, and Kotlin in the Neva Bay), Petrogradsky, Dekabristov and Krestovsky. The latter together with Yelagin and Kamenny island are covered mostly by parks. The Karelian Isthmus, North of the city, is a popular resort area. In the south Saint Petersburg crosses the Baltic-Ladoga Klint and meets the Izhora Plateau.

The elevation of Saint Petersburg ranges from the sea level to its highest point of 175.9 meters (577 ft) at the Orekhovaya Hill in the Duderhof Heights in the south. Part of the city's territory west of Liteyny Prospekt is no higher than 4 meters (13 ft) above sea level, and has suffered from numerous floods. Floods in Saint Petersburg are triggered by a long wave in the Baltic Sea, caused by meteorological conditions, winds and shallowness of the Neva Bay. The four most disastrous floods occurred in 1824 (421 centimeters / 166 inches above sea level, during which over three hundred buildings were destroyed^[34]), 1924 380 centimeters / 150 inches, 1777 321 centimeters / 126 inches, 1955 293 centimeters / 115 inches, and 1975 281 centimeters / 111 inches. To prevent floods, the Saint Petersburg Dam has been constructed.

Since the 18th century the terrain in the city has been raised artificially, at some places by more than 4 meters (13 ft), making mergers of several islands, and changing the hydrology of the city. Besides the Neva and its tributaries, other important rivers of the federal subject of Saint Petersburg are Sestra, Okhta and Izhora. The largest lake is Sestroretsky Razliv in the north, followed by Lakhtinsky Razliv, Suzdal Lakes and other smaller lakes.

Due to location at ca. 60° N latitude the day length in Petersburg varies across seasons, ranging from 5:53 to 18:50. A period from mid-May to mid-July when twilight may last all night is called the white nights.

Demographics

Saint Petersburg is the second largest city in Russia. Per the 2010 Census, the federal subject's population is 4,879,566, or 3.4% of the total population of Russian; up from 4,661,219 (3.21%) recorded in the 2002 Census,^[44] and down from 5,023,506 recorded in the 1989 Census.^[45]

The 2010 Census recorded the ethnic composition as follows:^{[6][not in citation given]} Russian 92.5%, Ukrainian 1.5%, Belarusians 0.9%, Jewish 0.6%, Tatar 0.7%, Uzbek 0.5%, Armenian 0.5%, Azeri 0.4%, Tajik 0.3%, Georgian 0.2%, Moldovan 0.2%, Finns 0.1%. Additionally, 652,827 people were registered from administrative databases, and could not declare an ethnicity. It is estimated that the proportion of ethnicities in this group is the same as that of the declared group.

The 20th century saw hectic ups and downs in population. From 2.4 million in 1916 it had dropped to less than 740,000 by 1920 during the Russian Revolution of 1917 and Russian Civil War. The minorities of Germans, Poles, Finns, Estonians and Latvians were almost completely transferred from Leningrad during the 1930s. From 1941 to the end of 1943, population dropped from 3 million to less than 600,000, as people died in battles, starved to death during the Siege of Leningrad, or were evacuated. After the siege, some of the evacuees returned, but most influx was due to migration from other parts of the Soviet Union. The city absorbed about 3 million people in the 1950s and grew to over 5 million in the 1980s. From 1991 to 2006 the city's population decreased to the current 4.6 million, while the suburban population increased due to privatization of land and massive move to suburbs. Based on the 2010 census results the current population is over 4.8 million. The birth rate remains lower than the death rate; people over 65 constitute more than twenty percent of the population; and the median age is about 40 years.

People in urban Saint Petersburg live mostly in apartments. Between 1918 and the 1990s, the Soviets nationalised housing and forced residents to share communal apartments (kommunalkas). With 68% living in shared flats in the 1930s, Leningrad was the city in the USSR with the largest number of kommunalkas. Resettling residents of kommunalkas is now on the way out, albeit shared apartments are still not uncommon. As new boroughs were built on the outskirts in the 1950s–1980s, over half a million low income families eventually received free apartments, and about an additional hundred thousand condos were purchased. While economic and social activity is concentrated in the historic city centre, the richest part of Saint Petersburg, most people live in commuter areas. For the first half of 2007, the birth rate was 9.1 per 1000.