Inner Carniola

It comprises the Hrušica karst plateau up to Postojna Gate, bordering the Slovenian Littoral (the Gorizia region) in the west.

The name was created by analogy with Inner Austria (German: Innerösterreich), referring to the southwestern Habsburg hereditary lands.

The territorial arrangement was described by the scholar Johann Weikhard von Valvasor (1641–1693) in his 1689 work The Glory of the Duchy of Carniola.

Part of the Napoleonic Illyrian Provinces from 1809, Carniola returned to the Austrian Empire by the 1814 Treaty of Paris.

In 1920, the Treaty of Rapallo transferred the western part of the region (with around two-thirds of the population) to the Kingdom of Italy.

Traditional regions of Slovenia.
Inner Carniola or Postojna District, late 18th-century map
The annexed western quarter of Slovene ethnic territory , and approximately 327,000 out of the total population of 1.3 [ 5 ] million Slovenes, [ 6 ] were subjected to forced Fascist Italianization . On the map of present-day Slovenia with its traditional regions' boundaries.