The Treaty of Bucharest (Romanian: Tratatul de la București; Serbian: Букурештански мир; Bulgarian: Букурещки договор; Greek: Συνθήκη του Βουκουρεστίου) was concluded on 10 August 1913, by the delegates of Bulgaria, Romania, Serbia, Montenegro and Greece.

Isolated and surrounded by a more powerful coalition of opponents, Bulgaria was forced to agree to a truce and to peace negotiations to be held in the Romanian capital, Bucharest.

All important arrangements and concessions involving the rectification of the controverted international boundary lines were perfected in a series of committee meetings, incorporated in separate protocols, and formally ratified by subsequent action of the general assembly of delegates.

The territory thus obtained by Serbia engulfed central Vardar Macedonia, including "Ochrida, Monastir, Kosovo, Istib, and Kotchana, and the eastern half of the Sanjak of Novi-Pazar".

This important territorial concession, which Bulgaria resolutely contested, in compliance with the instructions embraced in the notes which the Russian Empire and Austria-Hungary presented to the conference, increased the area of Greece from 64,790 to 108,610 km2 (25,020 to 41,930 sq mi) and its population from 2,660,000 to 4,363,000.

The Greek-Bulgarian border was moved eastwards to beyond Kavala, thus restricting the Aegean seaboard of Bulgaria to an inconsiderable extent of 110 km, with only Dedeagach (modern Alexandroupoli) as a seaport.

[4] In addition, Bulgaria agreed to dismantle all existing fortresses and bound itself not to construct forts at Rousse or Shumen or in any of the territory between these two cities, or within a radius of 20 kilometers around Balchik.

[citation needed] Bulgaria ceded to Romania Southern Dobruja, lying north of a line extending from the Danube just above Tutrakan (Turtucaia) to the western shore of the Black Sea, south of Ekrene (Ecrene); Southern Dobruja has an approximate area of 6,960 km2 (2,690 sq mi), a population of 286,000, and includes the fortress of Silistra and the cities of Tutrakan on the Danube and Balchik (Balcic) on the Black Sea.

In addition, the status quo of the islands of the Northeastern Aegean, which Greece had taken from the Ottomans, remained undetermined until February 1914, when the Great Powers recognized Greek sovereignty over them.

Tensions with the Ottomans remained high, however, in the face of persecutions of Anatolian Greeks, leading to a crisis and a naval race in summer 1914 that was stopped only by the outbreak of World War I.

[7] That's not to say, however, that the treaty went unnoticed, but the reactions among the Great Powers were mixed: there were rumblings from the capitals of Germany, Austria-Hungary and Russia, while the British and the French rejoiced in the "coming of age" of the Balkan states.