In the west, Mts. Kanin and Matajur stood on the border with the Friulian region, which until the 1797 Treaty of Campo Formio was part of the Republic of Venice, from 1815 onwards belonged to the Austrian Kingdom of Lombardy-Venetia and finally to the re-established Kingdom of Italy from 1866. In the south the province bordered on the territory of the Imperial Free City of Trieste and the Margraviate of Istria.