
Poland (Polish: Polska), officially the Republic of Poland (Polish: Rzeczpospolita Polska), is a country in Eastern Europe. Poland can also be considered part of Eastern, and Northern Europe. Poland is bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine and Belarus to the east; and the Baltic Sea, Lithuania and Kaliningrad Oblast, a Russian exclave, to the north. The total area of Poland is 312,679 km² (120,728 sq mi), making it the 69th largest country in the world and 5th in Europe. Poland's population is over 38.5 million people, concentrated mainly in urban areas.
The first Polish state was baptized in 966, within territory similar to the present boundaries of Poland. Poland became a kingdom in 1025, and in 1569 it cemented a long association with the Grand Duchy of Lithuania by uniting to form the Polish-Lithuanian Commonwealth. The Commonwealth collapsed in 1795. Poland regained its independence in 1918 after World War I but lost it again in World War II, occupied by Nazi Germany and the Soviet Union, emerging several years later as a communist country within the Eastern Bloc under the control of the Soviet Union. In 1989, communist rule was overthrown and Poland became what is informally known as the "Third Polish Republic." Poland is the 33rd most populous country in the world. Poland is a unitary state made up of sixteen voivodeships (Polish: województwo). Poland is also a member of NATO, OECD and the EU.
Poland’s territory extends across five geographical regions. In the northwest is the Baltic seacoast, which extends from the Bay of Pomerania to the Gulf of Gdansk. This coast is marked by several spits, coastal lakes (former bays that have been cut off from the sea), and dunes. The largely straight coastline is indented by the Szczecin Lagoon, the Bay of Puck, and the Vistula Lagoon. The centre and parts of the north lie within the Northern European Lowlands. Rising gently above these lowlands is a geographical region comprising the four hilly districts of moraines and moraine-dammed lakes formed during and after the Pleistocene ice age. These lake districts are the Pomeranian Lake District, the Greater Polish Lake District, the Kashubian Lake District, and the Masurian Lake District. The Masurian Lake District is the largest of the four and covers much of northeastern Poland. The lake districts form part of the Baltic Ridge, a series of moraine belts along the southern shore of the Baltic Sea. South of the Northern European Lowlands lie the regions of Silesia and Masovia, which are marked by broad ice-age river valleys. Farther south lies the Polish mountain region, including the Sudetes, the Cracow-Częstochowa Upland, the Świętokrzyskie Mountains, and the Carpathian Mountains, including the Beskids. The highest part of the Carpathians is the Tatra Mountains, along Poland’s southern border.
The major historical regions of Poland include Pomerania, Greater Poland, Silesia, Lesser Poland, Masovia, Warmia, Masuria, and Podlachia.

Opole ([ɔ:pɔlε] ; German: Oppeln (help·info)) is a city in southern Poland on the Oder River (Odra). It has a population of 129,553 and is the capital of the Opole Voivodeship, and also the seat of Opole County. It is the historical capital of Upper Silesia. Today, many German Upper Silesians and Poles of German ancestry live in the Opole region and the city itself.
Before the 5th century Germanic tribe of the Silingii and possibly Burgundians migrated into the region around Opole. After the Germanic tribes left to invade the Roman Empire, Western Slavic tribes moved into the area.
Opole developed since the 10th century as the regional capital of the Slavic Opolanie. Their first settlements were on the Wyspa Pasieka island in the middle of the Odra. At the end of the century Silesia became part of Poland and was ruled by the Piast dynasty; the land of the pagan Opolanie was conquered by Duke Bolesław I in 1012/1013. From the 11th-12th centuries it was also a castellany. After the death of Duke Władysław II the Exile, Silesia was divided in 1163 between two Piast lines- the Wrocławska line in Lower Silesia and the Opolsko-Raciborska of Upper Silesia; Opole became the capital of the latter duchy in 1217. In 1281 Upper Silesia was divided further between the heirs of the dukes, and the Duchy of Opole was established.
While German merchants had earlier established a colony in Opole at the crossing of the Oder, German peasants began arriving in 1217. Opole received German town law in 1254, which was expanded with Neumarkt law in 1327 and Magdeburg rights in 1410. Along with most of Silesia, in 1327 the Duchy of Opole came under the sovereignty of the Kingdom of Bohemia, itself part of the Holy Roman Empire. In 1521 the Duchy of Racibórz (Ratibor) was inherited by the Duchy of Opole, by then already known by the German name Oppeln. With the death of King Louis II of Bohemia at the Battle of Mohács, Silesia was inherited by Ferdinand I, placing Oppeln under the sovereignty of the Habsburg Monarchy of Austria. The Habsburgs took control of the region in 1532 after the line of local Piast dukes died out. Beginning in 1532 the Habsburgs pawned the duchy to different rulers (see Dukes of Opole). With the abdication of King John II Casimir of Poland as the last Duke of Opole in 1668, the region passed to the direct control of the Habsburgs.
King Frederick II of Prussia conquered most of Silesia from Austria in 1740 during the Silesian Wars; Prussian control was confirmed in the Peace of Breslau in 1742. From 1816-1945 Opole was the capital of Regierungsbezirk Oppeln within Prussia. The city became part of the German Empire during the unification of Germany in 1871.
After the defeat of Imperial Germany in World War I, a plebiscite was held on March 20, 1921 in Oppeln to determine if the city would be in the Weimar Republic or become part of the Second Polish Republic. 20,816 (94.7%) votes were cast for Germany, 1,098 (5.0%) for Poland, and 70 (0.3%) votes were declared invalid. Voter participation was 95.9%. However, at the time the voting population consisted only of ethnic Germans.
Oppeln was the administrative seat of the Province of Upper Silesia from 1919-1939. With the defeat of Poland in the Invasion of Poland at the beginning of World War II in 1939, eastern Upper Silesia was readded to the Province of Upper Silesa and Oppeln lost its status as provincial capital to Katowice (renamed Kattowitz again).
After the end of the Second World War in 1945, Oppeln was transferred from Germany to Poland according to the Potsdam Conference, and given its old Slavic name of Opole. Opole became part of the Katowice Voivodeship from 1946-1950, after which it became part of the Opole Voivodeship. Unlike other parts of historical eastern Germany ceded to remapped Poland, Opole and the surrounding region's German population remained and was not forcibly expelled as elsewhere, even though many ethnic Germans with right to German citizenship left to West Germany to flee the communist Eastern Bloc. Today Opole, along with the surrounding region, is known as a centre of the German-speaking Silesian minority in Poland.