High Quality Content by WIKIPEDIA articles! This is a list of rivers of Slovenia. There are 59 rivers in Slovenia, altogether measuring about 2,500 square kilometres (970 sq mi) in length. The total length of rivers in Slovenia is 26,989 kilometres (16,770 mi), which gives the river density 1,33 km/km2. The territory of Slovenia mainly (16,423 square kilometres or 6,341 square miles, i.e. 81%) belongs to the Black Sea basin, and a smaller part (16,423 square kilometres or 6,341 square miles, i.e. 19%) belongs to the Adriatic Sea basin. These two parts are divided into smaller units in regard to their central rivers, the Mura River basin, the Drava River basin, the Sava River basin with Kolpa River basin, and the basin of the Adriatic rivers.