Between Tamsweg and Unzmarkt - Frauenburg the river flows through a rural mountain valley .
Between Tamsweg and Unzmarkt - Frauenburg the river is closely paralleled by the 65 km ( 40 mi ) long narrow gauge Murtalbahn railway .
Between Tamsweg and Unzmarkt - Frauenburg the river flows through a rural mountain valley and is closely paralleled by the 65 km ( 40 mi ) long narrow gauge Murtalbahn railway .