Herzegovina
Herzegovina ( or ; Serbo-Croatian: "Hercegovina", Херцеговина, ) is the southern region of Bosnia and Herzegovina. While there is no official border distinguishing it from the Bosnian geographical region, it is sometimes asserted that the borders of the region are Dalmatia to the southwest, Montenegro to the east, Mount Maglić to the northeast, and Mount Ivan to the north. Measurements of the area range from , or around 22% of the total area of the present-day country, to , around 24% of the country.
Drina Banovina
The Drina Banovina or Drina Banate (Serbian and Bosnian: "Drinska banovina" / Дринска бановина), was a province (banovina) of the Kingdom of Yugoslavia between 1929 and 1941. Its capital was Sarajevo and it included portions of present-day Bosnia and Herzegovina and Serbia. It was named after the Drina River and, like all Yugoslav banovinas, was intentionally not based on ethnic boundaries. As a result of the creation of the Banovina of Croatia in 1939, its territory was reduced considerably.
According to the 1931 Constitution of the Kingdom of Yugoslavia, 
In 1941, the World War II Axis Powers occupied the Drina Banovina and the province was abolished and divided between the Independent State of Croatia and German-occupied Serbia. Following World War II, the region was divided between Bosnia and Herzegovina and Serbia within a federal Socialist Yugoslavia.