a European river; flows into the Baltic Sea

a river the flows through Poland, emptying into the Baltic Sea; Warsaw is on the Vistula. The Vistula is east of the Oder.

The Vistula is the longest river in Poland. It is 1,047 kilometers (678 miles) long and drains an area of 194,424 km² (75,067 sq. miles), of which 168,699 km² (65,135 sq. miles) lies within Poland (over half the area of the country) http://www.stat.gov.pl/opracowania_zbiorcze/maly_rocznik_stat/2005/01_war_nat_i_och_sro.pdf.