The Treaty of Neuilly, dealing with Bulgaria for its role as one of the Central Powers in World War I, was signed on the November 27, 1919 at Neuilly-sur-Seine, France.

The treaty required Bulgaria to cede land to its neighbors, reduce its army to 20,000 men, pay reparations exceeding $400 million, and recognize the existence of Yugoslavia.

It took away much land, for example Western Thrace to Greece, which was the coastline Bulgaria had to the Mediterranean via the Aegean Sea.

For the full text of the treaty, see http://www.lib.byu.edu/~rdh/wwi/1918p/neuilly.html

Bulgaria did however gain territory from the break-up of the Ottoman Empire in the east, under the Treaty of Sèvres.