Sava also Save (German Sau, Hungarian Száva) is a river in Slovenia, Croatia, Bosnia and Herzegovina and Serbia. Right side feeder of Danube at Belgrade. Length: 940 km. Watershed: 95,720 km2. In Roman times the river was named Savus.
Its main tributaries are in Slovenia: the Savinja, Mirna and Krka rivers, in Croatia: the Kupa (Slovenian Kolpa), Lonja, Orljava and Bosut rivers, in Bosnia: the Una, Vrbas, Ukrina, Bosna, Tinja, Lukovac and Drina rivers and in Serbia the Kolubara river.
Major cities along the Sava are in Slovenia: Kranj, Zagorje, Trbovlje, Hrastnik, Radeče, Sevnica, Krško, Brežice, in Croatia: Zagreb, Sisak, Slavonski Brod and Županja, in Bosnia: Bosanski Šamac and Brčko and in Serbia: Sremska Mitrovica, Šabac and of course Belgrade.
Sava is common male personal name in south Slavic languages. Perhaps most famous example is the Serbian medieval prince turned monk Saint Sava. In Bosnia Sava could also be female name, following tradition of naming female children like rivers.