The Pivka Basin or the Pivka Valley, also simply Pivka, is a varied basin in southwestern Slovenia, lying between high Dinaric plateaus, the Karst Plateau, and the Brkini Hills. It covers an area of 160 square kilometres (62 sq mi). To the northwest, it is bordered by Mt. Nanos, to the north, by Hrušica, to the east by the Javornik Hills and Mt. Snežnik, and to the west by the lower and . The lower part of the basin between Nanos and the Postojna Gate is known as the Lower Pivka Basin, and the upper part between Prestranek and Snežnik as the Upper Pivka Basin.