Drava
…length of 710km (441 miles), or 724km (450 miles), if the length of its Sextner Bach source is added, it is the fifth or sixth longest tributary of the Danube, after the Tisza, Sava, Prut, Mureș and likely Siret. The Drava drains an area of about 40,154 square kilometers (15,504 sq. mi.). Its mean annual…