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Chernivtsi Oblast, also referred to as Chernivechchyna (Чернівеччина), is an oblast (province) in western Ukraine, consisting of the northern parts of the historical regions of Bukovina and Bessarabia. It has an international border with Romania and Moldova. The region spans 8,100 square kilometres (3,100 sq mi). The oblast is the smallest in Ukraine both by area and population. It has a population of 890,457, and its administrative center is the city of Chernivtsi. In 1408, Chernivtsi was a town in Moldavia and the chief centre of the area known as Bukovina. Chernivtsi later passed to the Turks and then in 1774 to the Habsburg monarchy. After World War I, it was ceded to Romania, and in 1940, the town was acquired by the Ukrainian SSR. The oblast has a large variety of landforms: the Carpathian Mountains and picturesque hills at the foot of the mountains gradually change to a broad partly forested plain situated between the Dniester and Prut rivers.