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The Vistula (/ ˈ v ɪ s tj ʊ l ə /; Polish: Wisła, Polish pronunciation:, German: Weichsel) is the longest river in Poland and the ninth-longest in Europe, at 1,047 kilometres (651 miles) in length. Its drainage basin, extending into three other countries apart from Poland, covers 193,960 km (74,890 sq mi), of which 168,868 km (65,200 sq mi) is in Poland.

The Vistula rises at Barania Góra in the south of Poland, 1,220 meters (4,000 ft) above sea level in the Silesian Beskids (western part of Carpathian Mountains), where it begins with the White Little Vistula (Biała Wisełka) and the Black Little Vistula (Czarna Wisełka). It flows through Poland's largest cities, including Kraków, Sandomierz, Warsaw, Płock, Włocławek, Toruń, Bydgoszcz, Świecie, Grudziądz, Tczew and Gdańsk. It empties into the Vistula Lagoon (Zalew Wiślany) or directly into the Gdańsk Bay of the Baltic Sea with a delta of six main branches (Leniwka, Przekop, Śmiała Wisła, Martwa Wisła, Nogat and Szkarpawa).

The river has many associations with Polish culture, history and national identity. It is Poland's most important waterway and natural symbol, flowing notably through Kraków and the capital Warsaw, and the phrase "Country upon Vistula" (Polish: kraj nad Wisłą) can be synonymous with Poland. Historically, the river was also important for the Baltic and German (Prussian) peoples.

The Vistula has given its name to the last glacial period that occurred in northern Europe, approximately between 100,000 and 10,000 BC, the Weichselian glaciation.