The Treaty of Belgrade was the peace treaty signed on September 18, 1739 in Belgrade, Serbia by the Ottoman Empire on one side and the Austria on the other. This ended the hostilities of the two-year Austrian-Ottoman war, in which Austria joined Russia in its fight against the Ottoman Empire.
With the Treaty of Belgrade, Austria ceded Northern Serbia with Belgrade and Lesser Wallachia, gained by the Treaty of Passarowitz in 1718 to Turkey and set the demarcation line to the rivers Sava and Danube.
The Austrian withdrawal forced Russia also to accept peace with Treaty of Nissa, by which Russia gave up the Crimea and Moldavia, but was still allowed to build a port at Azov, again gaining a foothold on the Black Sea.
