The Šalek Valley (Slovene: Šaleška dolina) or the Velenje Basin (Velenjska kotlina) is a basin in northern Slovenia in the northeastern pre-alpine foothills. It is named after Šalek Castle near the town of Velenje. The valley lies between the Kamnik-Savinja Alps to the west, the Pohorje Mountain Range to the east, and the Sava Hills to the south. It has a northwest-southeast orientation and is approximately 8 km long and 2 km wide. It contains a number of rivers and lakes. The Paka River runs through Velenje, with a number of tributaries from the northwest: Trebušnica Creek, Veriželj Creek and Slatina Creek. The Paka itself eventually flows into the Savinja River.