The Sava (river) reference article from the English Wikipedia on 24-Apr-2004
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Sava (river)

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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 ob Savi, 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.