Ostashkovsky District
| Ostashkovsky District Осташковский район (Russian) |
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 Location of Ostashkovsky District in Tver Oblast |
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| Coordinates: 57°09′N 33°06′E / 57.150°N 33.100°ECoordinates: 57°09′N 33°06′E / 57.150°N 33.100°E | |
| Location | |
| Country | Russia |
| Federal subject | Tver Oblast |
| Administrative structure (as of 2013) | |
| Administrative center | town of Ostashkov |
| Administrative divisions: | |
| Urban settlements | 1 |
| Rural settlements | 10 |
| Inhabited localities: | |
| Cities/towns | 1 |
| Rural localities | 247 |
| Municipal structure (as of March 2013) | |
| Municipally incorporated as | Ostashkovsky Municipal District |
| Municipal divisions: | |
| Urban settlements | 1 |
| Rural settlements | 10 |
| Statistics | |
| Area | 3,200 km2 (1,200 sq mi) |
| Population (2010 Census) | 23,761 inhabitants |
| • Urban | 76.1% |
| • Rural | 23.9% |
| Density | 7.43/km2 (19.2/sq mi) |
| Time zone | MSK (UTC+03:00) |
| Official website | |
| on | |
Ostashkovsky District (Russian: Оста́шковский райо́н) is an administrative and municipal district (raion), one of the thirty-six in Tver Oblast, Russia. It is located in the northwest of the oblast and borders with Demyansky District of Novgorod Oblast in the north, Firovsky District in the northwest, Kuvshinovsky District in the east, Selizharovsky District in the south, Penovsky District in the southwest, and with Maryovsky District of Novgorod Oblast in the west. The area of the district is 3,200 square kilometers (1,200 sq mi). Its administrative center is the town of Ostashkov. Population: 23,761 (2010 Census);7,357 (2002 Census);8,921 (1989 Census). The population of Ostashkov accounts for 76.1% of the district's total population.
The major part of the district belongs to the drainage basin of the Volga River. The source of the Volga is located in the district, in the selo of Volgoverkhovye. The district is locates in the southern outskirts of the Valdai Hills, and there is a large lake district in the area of Ostashkovsky District. The biggest lakes in the area are Lake Seliger, with the town of Ostashkov located on its shore, Lake Volgo and Lake Sterzh (parts of Upper Volga Reservoir), and Lake Sig. Both Seliger (via the Selizharovka River) and Sig drain into the Volga, Verkhyaya Volga Reservoir is built in the upper course of the Volga, and the Volga flows through Lake Volgo. Minor areas in the northwest of the district belong to the basin of the Pola River in the basin of the Neva, and rivers in the northeast of the district drain to the Shlina River, also in the drainage basin of the Neva. The Neva drains into the Baltic Sea, and the Volga drains into the Caspian Sea. Thus, the divide between the Atlantic Ocean and the Caspian Sea runs through the district.
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