Most of the region is located in Poland except for a small portion in southeastern end which is in Ukraine.
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 filled in by Miocene strata (up to 300 m (980 ft) thick) covered with glacial and alluvial deposits.
Loess can be found in parts of the plateaus, and dunes are situated in some of its sandy reaches.
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