Pirin Macedonia (region)
It covers an area of about 6,798 km2 which is 10.18% of the geographical region Macedonia. One of the regional centers is Blagoevgrad, also known as Gorna Dzumaya, the old name of the city. The region is bordering with Kyustendil Province and Sofia Province on the north, Pazardzhik Province and Smolyan Province on the east, Greece on the south and Republic of Macedonia on the west. The population is estimated around 325.000 people.
Treaty of Bucharest (1913)
The eastern frontier of Serbia was drawn from the summit of Patarika, on the old frontier, and followed the watershed between the Vardar and the Struma rivers to the Greek-Bulgarian boundary, except that the upper valley of the Strumica remained in the possession of Bulgaria. The territory thus obtained by Serbia engulfed central Vardar Macedonia, including "Ochrida, Monastir, Kossovo, Istib, and Kotchana, and the eastern half of the sanjak of Novi-Bazar". These territories would today include Novi Pazar in Serbia, the disputed territory of Kosovo, and Ohrid, Štip, Kočani and Bitola in present-day Republic of Macedonia. By this arrangement, Serbia increased its territory from 48,300 to 87,780 km2 and its population by more than 1.5 million.