Herzegovina, is the southern and smaller of two main geographical regions of Bosnia and Herzegovina, the other being Bosnia. It presently does not have strictly defined administrative borders; however, in the past it was organized as Sanjak of Herzegovina (1470–1833; 1851–1912) and Herzegovina Eyalet (1833–1851). Bosnia, the larger of the two regions, lies to the north of Herzegovina; the Croatian region of Dalmatia lies to the southwest; the Montenegrin region of Old Herzegovina lies to the southeast. The land area of Herzegovina is around 12,000 km2 (4,600 sq mi), or around 23–24% of the country. The largest city is Mostar, in the center of the region. Other large settlements include Trebinje, Široki Brijeg, Ljubuški, Čapljina, Konjic and Posušje.