The Vipava Valley is a valley in the Slovenian Littoral, roughly between the village of Podnanos to the east and the border with Italy to the west. The main towns are Ajdovščina and Vipava.

The Slovene Littoral, or simply Littoral, is one of the traditional regions of Slovenia. The littoral in its name – for a coastal-adjacent area – recalls the former Austrian Littoral, the Habsburg possessions on the upper Adriatic coast, of which the Slovene Littoral was part. Today, the Littoral is often associated with the Slovenian ethnic territory that, in the first half of the 20th century, found itself in Italy to the west of the Rapallo Border, which separated a quarter of Slovenes from the rest of the nation, and was strongly influenced by Italian fascism.