The Leitha (German: [ˈlaɪtaː] ; Hungarian: Lajta, formerly Sár(-víz); Slovene: Litva; Czech and Slovak: Litava) is a river in Austria and Hungary, a right tributary of the Danube. It is 120.8 km (75.1 mi) long (168.5 km (104.7 mi) including its source river Schwarza). Its basin area is 2,138 km (825 sq mi).