Southern Dobruja, South Dobruja or Quadrilateral (Bulgarian: Южна Добруджа, Yuzhna Dobrudzha or simply Добруджа, Dobrudzha; Romanian: Dobrogea de Sud, Cadrilater or Dobrogea Nouă) is an area of northeastern Bulgaria comprising Dobrich and Silistra provinces, part of the historical region of Dobruja. It has an area of 7,566 km² and a population of 358,000. It was a part of Romania de jure from 1913 to 1918 (de facto from 1913 to 1916) and again from 1919 to 1940.
At the beginning of the modern era, Southern Dobruja had a mixed population of Bulgarians and Turks with several smaller minorities, including Gagauz, Crimean Tatars and Romanians. In 1910, of the 282,007 inhabitants of Southern Dobruja, 134,355 (47.6%) were Bulgarians, 106,568 (37.8%) Turks, 12,192 (4.3%) Roma, 11,718 (4.1%) Tatars, and 6,484 (2.4%) Romanians.
Southern Dobruja was part of the autonomous Bulgarian principality from 1878 and part of the independent Bulgarian state from 1908 until Bulgaria's defeat in the Second Balkan War, when the region was ceded to Romania under the Treaty of Bucharest (1913).
In 1914, Romania demanded all landowners prove their property and surrender to the Romanian state one third of the land they claimed or pay an equivalent of its value. This was similar to the agrarian reforms in Romania which occurred the previous century, in which the landlords had to give up two-thirds of their land, which was then handed over to the peasants. In Southern Dobruja, many of the peasants who received the land were settlers, including tens of thousands of Aromanians from Macedonia, as well as Megleno-Romanians from the same place and Romanians from Wallachia, which led to claims that the reforms had a nationalist purpose.
On 7 September 1940, Southern Dobruja was restored to Bulgaria under the Treaty of Craiova. The treaty was followed by a mandatory population exchange: about 110,000 Romanians (almost 95% of whom settled there after 1913), Aromanians and Megleno-Romanians were forced to leave Southern Dobruja, whereas 77,000 Bulgarians had to leave Northern Dobruja. Only a few hundred Romanians and Aromanians are now left in the region.
|Bulgarian||134,355 (47.6%)||143,209 (37.9%)||248,382 (69.5%)||192,698 (68%)|
|Turkish||106,568 (37.8%)||129,025 (34.1%)||76,992 (21.6%)||72,963 (25.75%)|
|Roma||12,192 (4.3%)||7,615 (2%)||25,127 (7%)||12,163 (4.29%)|
|Tatar||11,718 (4.2%)||6,546 (1.7%)||4,515 (1.3%)||808 (0.29%)|
|Romanian||6,348 (2.3%)2||77,728 (20.5%)||591 (0.2%)2||947 (0.33%)|
- 1According to the 1926–1938 Romanian administrative division (counties of Durostor and Caliacra), which included a part of today's Romania (chiefly the communes of Ostrov and Lipnița, now part of Constanța County) and excluded a part of today's Bulgaria (parts of General Toshevo and Krushari municipalities)
- 2Including persons counted as Vlachs in Bulgarian Census
- 3Only includes persons who answered the optional question on ethnic identity. The total population was 309,151.
- Theodore I. Geshkoff. Balkan Union: A Road to Peace in Southeastern Europe, Columbia University Press, 1940, p. 57
- Țîrcomnicu, Emil (2014). "Historical aspects regarding the Megleno-Romanian groups in Greece, the FY Republic of Macedonia, Turkey and Romania" (PDF). Memoria Ethnologica. 14 (52–53): 12–29.
- „Problema Cadrilaterului - diferendum teritorial şi repere imagologice (1913-1940)”, George Ungureanu
- Deletant, Dennis (2006). Hitler's forgotten ally: Ion Antonescu and his regime, Romania 1940-1944. Palgrave Macmillan. pp. 1–376. ISBN 9781403993410.
- Costea, Maria (2009). "Aplicarea tratatului româno-bulgar de la Craiova (1940)". Anuarul Institutului de Cercetări Socio-Umane "Gheorghe Șincai" al Academiei Române (in Romanian) (12): 267–275.
- Calculated from results of the 1930 census per county, taken from Mănuilă, Sabin (1939). La Population de la Dobroudja (in French). Bucarest: Institut Central de Statistique. OCLC 1983592.
- Calculated from the results of the 2001 Bulgarian census for the administrative regions of Dobrich and Silistra, from "Население към 01.03.2001 г. по области и етническа група" (in Bulgarian). Националния статистически институт. Retrieved 2007-05-02.
- Calculated from the results of the 2011 Bulgarian census for the administrative regions of Dobrich and Silistra, from "Население по етническа група и майчин език" (in Bulgarian). Националния статистически институт. Retrieved 2015-11-20.