|Treaty of Bucharest|
| May 7, 1918|
|Signatories|| German Empire|
Among its terms:
- Romania had to return Southern Dobruja and to cede the southern part of Northern Dobruja to Bulgaria, while the rest of the province remained under the joint control of the Central Powers.
- Romania had to give Austria-Hungary control of the passes of the Carpathian Mountains.
- Romania had to lease its oil wells to Germany for 90 years.
- The Central Powers recognized the Union of Bessarabia with Romania.
Alexandru Marghiloman negotiated and signed the Treaty of Bucharest with the Central Powers on May 7, 1918. However, King Ferdinand I of Romania refused to sign the treaty (already ratified by the Chamber of Deputies on June 28 and by the Senate on July 4, 1918). In the end the king signed it and withdrew Romania from the war.
Although Bulgaria received a part of Northern Dobruja, it continued to lobby Germany and Austria-Hungary for the annexation of the whole province, including the condominium established by the Treaty of Bucharest. After negotiations, a protocol regarding the transfer of the jointly administered zone in Northern Dobruja to Bulgaria was signed on September 25, 1918, in Berlin by Germany, Austria-Hungary, Ottoman Empire and Bulgaria. As compensation Bulgaria agreed to cede the left bank of the Maritsa river to Turkey.