The highest mean temperatures for the whole year are those of Lenkoran (60.3°) and of Sukhum-kaleh and Poti (about 58°), and the lowest at Ardahan (5840 ft.), in the province of Kars, namely, 37.9°, and at Gudaur (7245 ft.), a few miles south of Kasbek, namely, 38.6°.
Interested had arrived at an understanding as to the modifications to be introduced in the treaty, and by a convention concluded with Turkey on the 4th of June 1878 England had undertaken to defend the Asiatic dominions of the sultan by force of arms, provided that his majesty carried out all the necessary reforms, to be agreed upon later, and assigned to England the island of Cyprus, which was however to be restored if Turkey fulfilled her engagements as to reforms and if Russia gave back to her Kars, Ardahan and Batum.
On the 13th of July 1878 the Treaty of Berlin was signed: the Great Bulgaria of the San Stefano Treaty was diminished to an autonomous province north of the Balkans, the south-eastern portion, no longer extending to the Aegean, was formed into a self-governing tributary province styled Eastern Rumelia; Turkey abandoned all pretension to suzerainty over Montenegro; Servia and Rumania received their independence (but the last named was made to cede Bessarabia to Russia, receiving instead the Dobruja); the Asiatic frontier was readjusted, Kars, Ardahan and Batum becoming Russian.
Turkish troops occupied these provinces of Ardahan and Kars during 1918, and penetrated still farther into Trans-Caucasia.
The Turko-Russian War of 1828-29, which advanced the Russian frontier to the Arpa Chai, was followed by a large emigration of Armenians from Turkish to Russian territory, and a smaller exodus took place after the war of 1877-78, which gave Batum, Ardahan and Kars to Russia.