The Seret (Ukrainian: Серéт) is the left tributary of the Dniester that flows through the Ternopil Oblast of Ukraine. It is 248 kilometres (154 mi) long and its basin area is 3,900 square kilometres (1,506 sq mi). The towns of Ternopil, Terebovlia and Chortkiv sit along the river's banks. Some of the bloodiest fighting of World War I took place on the banks of the Seret.
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Ternopil Oblast (Ukrainian: Тернопільська область, romanized: Ternópilʹsʹka óblastʹ), also referred to as Ternopilshchyna (Ukrainian: Тернопільщина, romanized: Ternópilʹščyna) or Ternopillia (Ukrainian: Тернопілля, romanized: Ternopíllja), is an oblast (province) of Ukraine. Its administrative center is Ternopil, through which flows the Seret, a tributary of the Dniester. Population: 1,021,713 (2022 estimate).
One of the natural wonders of the region are its cave complexes. Although Ternopil Oblast is among the smallest regions in Ukraine, over 100 caves have been discovered there. Scientists believe these are only 20% of all possible caves in the region. The biggest cave is Optymistychna Cave. Measuring 267 km (166 mi) in total length, it is the longest cave in Eurasia and the fifth-longest in the world. Twenty percent of the land in the region is chernozem soil.
Ternopil, known until 1944 mostly as Tarnopol, is a city in western Ukraine, located on the banks of the Seret River. Ternopil is one of the major cities of Western Ukraine and the historical regions of Galicia and Podolia. The population of Ternopil was estimated at 225,004 (2022 estimate).
The city is the administrative center of Ternopil Oblast (region), as well as of surrounding Ternopil Raion (district) within the oblast. It hosts the administration of Ternopil urban hromada, one of the hromadas of Ukraine.