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.
SAO Herzegovina
SAO Herzegovina was formed from the Association of Municipalities (a government in SFRY) known as "Assembly of the Communities of East Herzegovina", which was formed on 27 May 1991. The SAO East and Old Herzegovina was established on September 12, 1991. It consisted of East Herzegovina which had a Serb ethnic majority. Its capital was Trebinje.