Drava

The Drava is a river in southern Central Europe. It is the fifth or sixth-longest tributary of the Danube, after the Tisza, Sava, Prut, Mureș, and possibly the Siret, with a length of 456 miles including the Sextner Bach source.

Its source is in the Puster Valley of South Tyrol/Alto Adige, Italy, near the market town of Innichen/San Candido. The Drava River runs eastward through Austria's East Tirol and Carinthia into Slovenia's Styria region. It then turns southeast, going through Croatia and, after joining its main tributary Mur, forming the majority of the border between Croatia and Hungary before joining the Danube near Osijek.

In terms of hydropower, the Drava River is one of the most exploited rivers in the world, with about 100 percent of its water potential energy being used/ Because the river's region has unique biodiversity, this creates various ecological concerns, in addition to other types of exploitation such as the usage of river deposits.

Length: 465 miles (shared with Italy, Austria, Slovenia, and Croatia)