In Bulgaria most Aromanians were concentrated in the region south-west of Sofia, in the region called Pirin, formerly part of the Ottoman Empire until 1913. Due to this reason, a large number of these Aromanians moved to Southern Dobruja, part of the Kingdom of Romania after the Treaty of Bucharest of 1913. After the reinclusion of Southern Dobruja in Bulgaria with the Treaty of Craiova of 1940, most were moved to Northern Dobruja in a population exchange. Another group moved to northern Greece. Nowadays, the largest group of Aromanians in Bulgaria is found in the southern mountainous area, around Peshtera. Most Aromanians in Bulgaria originate from Gramos Mountains, with some from North Macedonia, Pindus Mountains and Moscopole.