The Vistula, in Polish the Wisla, is the longest river in Poland. It is 1047 km long and it runs through Slovakia, Belarus, Ukraine and Poland. The Vistula has its source Slesian Beskids, a mountain range in Poland and the Czech Republic. Around the middle of its length, it runs through Krakow and also passes Warsaw. Near Gdansk, it finally flows into the Baltic Sea.
Like many other rivers in Europe, the Vistula is at risk for flooding.