Historical regions of Romania

• Muntenia ;
• Oltenia : the territory between the rivers Danube and Olt and the Southern Carpathian became part of the Principality of Wallachia in the early 14th century.

• Western Moldavia: in today's form part of Romania since 1944;
• Southern Bukovina: following the union with Romania in 1918.

• Northern Dobruja: in Romania since 1878.

• Transylvania proper: following the declaration of the union with Romania in 1918;
• Banat: since 1918 claimed and eventually divided between Romania, Kingdom of Serbs, Croats and Slovenes and Hungary;
• Crișana: the region bordered by the rivers Mureș and Someș and the Apuseni Mountains following the declaration of the union in 1918, eventually divided between Hungary and Romania;
• Maramureș: part of the mountainous northwestern region following the declaration of the union in 1918, eventually divided between Czechoslovakia and Romania.

• Bessarabia: This territory was part of Moldavia until 1812. The entire region became part of Romania from 1918 to 1940 when it got occupied by the Soviets. Romania managed to annex it again, but lost it during World War II.
• Southern Bessarabia : In 1856, the southern part of Bessarabia was returned to Moldavia, which united with Wallachia in 1859 to create modern Romania. In 1878, Romania was pressured into exchanging this territory for the Dobruja, and the Russian rule was restored over it.
• Northern Bukovina: The region was part of Romania from 1918 to 1940 when it got occupied by the Soviets; Romania managed to annex it again, but lost it in 1944, during World War II. Today is part of the Chernivtsi Oblast in Ukraine.
• Hertza region: A territory of Moldavia, it was part of Romania from 1859 to 1940, when it was occupied by the Soviets; Romania managed to annex it again, but lost it during World War II. Today is part of the Chernivtsi Oblast in Ukraine.
• Southern Dobruja: Was annexed from Bulgaria in 1913, after the Second Balkan War. It became Bulgarian again after 1940.
• Snake Island: An island located in the Black Sea, that was part of Romania between 1878–1948.

• Transnistria Governorate: A Romanian-administered territory from 1941 to 1944.