Oder River in the context of "Wrocław"

Czech Silesia (Czech: České Slezsko; Polish: Śląsk Czeski) is the part of the historical region of Silesia now in the Czech Republic. While it currently has no formal boundaries, in a narrow geographic sense, it encompasses most or all of the territory of the Czech Republic within the Oder River's drainage basin. Together with Bohemia and Moravia, it is one of the three historical Czech lands.

Silesia lies in the north-east of the Czech Republic, predominantly in the Moravian-Silesian Region, with a section in the northern Olomouc Region. It is almost identical in extent with Austrian Silesia (also known as the Duchy of Upper and Lower Silesia), before 1918; between 1938 and 1945, part of the area was also known as Sudeten Silesia (German: Sudetenschlesien; Czech: Sudetské Slezsko; Polish: Śląsk Sudecki.

Mieszko I (Polish pronunciation: [ˈmjɛʂkɔ ˈpjɛrfʂɨ] ; c. 930 – 25 May 992) was Duke of Poland from 960 until his death in 992 and the founder of the first unified Polish state, the Civitas Schinesghe. A member of the Piast dynasty, he was the first Christian ruler of Poland and continued the policies of both his father Siemomysł and his grandfather Lestek, who initiated a process of unification among the Polish tribes and the creation of statehood.

According to existing sources, Mieszko I was a potent politician, a talented military leader and a charismatic ruler. Through both alliances and military force, he extended ongoing Polish conquests. Early in his reign, he subjugated Kuyavia and likely Gdańsk Pomerania and Masovia. For most of his reign, Mieszko I waged war for control of Western Pomerania. He eventually annexed it to the vicinity of the lower Oder River. His internal reforms were aimed at expanding and improving the so-called war monarchy system. During the last years of his life, he fought the Bohemian state and captured Silesia and lands now constituting Lesser Poland.

Opole (Polish: [ɔˈpɔlɛ] ; German: Oppeln; Silesian: Ôpole; Silesian German: Uppeln) is a city located in southern Poland on the Oder River and the historical capital of Upper Silesia. With a population of approximately 127,387 as of the 2021 census, it is the capital of Opole Voivodeship (province) and the seat of Opole County. Its metropolitan area was home to 146,522 inhabitants. It is the largest city in its province.

Its history dates to the 8th century, and Opole is one of the oldest cities in Poland. An important stronghold in Poland, it became a capital of a duchy within medieval Poland in 1172, and in 1217 it was granted city rights by Duke Casimir I of Opole, the great-grandson of Polish Duke Bolesław III Wrymouth. During the Medieval Period and the Renaissance, the city was known as a centre of commerce; several main trade routes intersected here, which helped to generate steady profits from transit trade. The rapid development of the town was also caused by the establishment of a seat of regency in Opole in 1816. The first railway connection between Opole, Brzeg and Wrocław was opened in 1843 and the first manufacturing plants were constructed in 1859, which greatly contributed to the city's regional significance.

The Lugii (or Lugi, Lygii, Ligii, Lugiones, Lygians, Ligians, Lugians, or Lougoi) were a group of tribes mentioned by Roman authors living in ca. 100 BC–300 AD in Central Europe, north of the Sudetes mountains in the basin of upper Oder and Vistula rivers, covering most of modern southern and middle Poland (regions of Silesia, Greater Poland, Mazovia and Lesser Poland).

Most archaeologists identify the Lugians with the Przeworsk culture, which is also associated with the Vandals, and it has been suggested that the Lugians and Vandals may have been closely related or even the same. While this culture was strongly Celtic-influenced in early Roman times, the Lugii are also sometimes regarded as Germanic, like the Vandals.

Gliwice (Polish: [ɡliˈvit͡sɛ] ; Silesian: Glywice, Czech: Hlivice; German: Gleiwitz) is a city in Upper Silesia, in southern Poland. The city is located in the Silesian Highlands, on the Kłodnica river (a tributary of the Oder). It lies approximately 25 km (16 mi) west from Katowice, the regional capital of the Silesian Voivodeship.

Gliwice is the westernmost city of the Metropolis GZM, a conurbation of 2.0 million people, and is the third-largest city of this area, with 175,102 permanent residents as of 2021. It also lies within the larger Katowice-Ostrava metropolitan area which has a population of about 5.3 million people and spans across most of eastern Upper Silesia, western Lesser Poland and the Moravian-Silesian Region in the Czech Republic. Gliwice is bordered by three other cities and towns of the metropolitan area: Zabrze, Knurów and Pyskowice. It is one of the major college towns in Poland, thanks to the Silesian University of Technology, which was founded in 1945 by academics of Lwów University of Technology. Over 20,000 people study in Gliwice. Gliwice is an important industrial center of Poland. Following an economic transformation in the 1990s, Gliwice shifted from steelworks and coal mining to automotive and machine industry.

Ruda Śląska (German: Ruda O.S.; Silesian: Ślōnsko Ruda) is a city in Silesia in southern Poland, near Katowice. It is a city in the Metropolis GZM, a metropolis with a population of two million. It is in the Silesian Highlands, on the Kłodnica River (tributary of the Oder).

It has been part of the Silesian Voivodeship since its formation in 1999. Previously, it was in Katowice Voivodeship, and before then, part of the Autonomous Silesian Voivodeship. Ruda Śląska is one of the cities in the Katowice urban area (population 2.7 million) and within the greater Katowice-Ostrava metropolitan area (population 5,294,000). The population of the city is 135,008 (December 2021).

Farther Pomerania, Hinder Pomerania, Rear Pomerania or Eastern Pomerania (Polish: Pomorze Tylne; German: Hinterpommern, Ostpommern), is a subregion of the historic region of Pomerania in north-western Poland, mostly within the West Pomeranian Voivodeship, while its easternmost parts are within the Pomeranian Voivodeship.

It is the part of Pomerania which comprised the eastern part of the Duchy and later Province of Pomerania. It stretched roughly from the Oder River in the West to Pomerelia in the East. The Polish term Pomorze Zachodnie ("Western Pomerania") is colloquially used in contemporary Poland as a synonym for the West Pomeranian Voivodship whose borders do not match the historical ones; in Polish historical usage, it applied to all areas west of Pomerelia (i.e. to the entire narrow Pomerania).