Sian Lowland or Oversian basin ( uk, Надсіанська котловина) is a lowland located at the border between

Poland Poland, officially the Republic of Poland, is a country in Central Europe. It is divided into 16 administrative provinces called voivodeships, covering an area of . Poland has a population of over 38 million and is the fifth-most populou ...

and

Ukraine Ukraine ( uk, Україна, Ukraïna, ) is a country in Eastern Europe. It is the second-largest European country after Russia, which it borders to the east and northeast. Ukraine covers approximately . Prior to the ongoing Russian inva ...

along the San River. Most of the region is located in Poland except for a small portion in southeastern end which is in Ukraine. The lowland is located between Malopolska Upland, Carpathian Foothills, Opillia Upland and Roztochia. To the southeast it extends into Dniester Lowland over the Sian-Dniester Divide. The Sian Lowland is a tectonic depression along the foothills of the

Carpathian Mountains The Carpathian Mountains or Carpathians () are a range of mountains forming an arc across Central Europe. Roughly long, it is the third-longest European mountain range after the Urals at and the Scandinavian Mountains at . The range stretche ...

filled in by

Miocene The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recen ...

strata In geology and related fields, a stratum ( : strata) is a layer of rock or sediment characterized by certain lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible surfaces known as e ...

(up to thick) covered with

glacial A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on the other hand, are periods of warmer climate betwe ...

and alluvial deposits. It consists of elevated plateaus (the tallest being Tarnohorod) dissected by the valleys of rivers, such as the Tanew River, the Liubachivka River, the Shklo River, and the Vyshnia River.

Loess Loess (, ; from german: Löss ) is a clastic, predominantly silt-sized sediment that is formed by the accumulation of wind-blown dust. Ten percent of Earth's land area is covered by loess or similar deposits. Loess is a periglacial or aeoli ...

can be found in parts of the plateaus, and dunes are situated in some of its sandy reaches. A large proportion of the lowland's forests have been cleared out, although pine forests mixed with firs and birches occur in the region's sandy areas, and fir forests mixed with

hornbeam Hornbeams are hardwood trees in the flowering plant genus ''Carpinus'' in the birch family Betulaceae. The 30–40 species occur across much of the temperate regions of the Northern Hemisphere. Origin of names The common English name ''hornbeam ...

s and maples grow in its heavier soils. The lowland has a population density of 80 persons/km²; the population is predominantly (75%) rural.

External links

Sian Lowland
at

Encyclopedia of Ukraine The ''Encyclopedia of Ukraine'' ( uk, Енциклопедія українознавства, translit=Entsyklopediia ukrainoznavstva), published from 1984 to 2001, is a fundamental work of Ukrainian Studies. Development The work was creat ...

Plains of Poland Plains of Ukraine East European Plain {{Ukraine-geo-stub