Lower Carniola is delineated by the Ljubljana Basin with the city of Ljubljana to the northwest, by the Kolpa River and the border with Croatia with the Gorjanci Mountains to the south and southeast, by the Sava River to the north and northeast, and by Mount Krim, the Bloke Plateau, and the Potok Plateau (Slovene: Potočanska planota) to the west.

The historic centre of Lower Carniola is Novo Mesto, and other towns include Kočevje, Grosuplje, Krško, Trebnje, Mirna, Črnomelj, Semič, and Metlika.

While the bulk of the population spoke Slovene, the German-speaking exclave of the Gottschee Germans existed around Kočevje in the south.

This division remained, in various arrangements, up to the 1860s, when the old administrative districts were abolished and Lower Carniola was subdivided into the smaller Bezirke of Novo Mesto (Rudolfswert), Kočevje (Gottschee), and Krško (Gurkfeld).

Lower Carniola shares most of the common Slovene cuisine, with emphasis on grilled meat and local wine, such as Cviček.