|The territory of modern Nagorno-Karabakh forms a portion of the historic region of Karabakh, which lies between the rivers Kura and Araxes, and the modern Armenia-Azerbaijan border. In the ancient and medieval times, this larger region consisted of the historic provinces of Artsakh and Utik, which at various times alternated between the kingdoms of Armenia and Caucasian Albania. Beginning with the 13th and 14th centuries, the Artsakh-Utik area received the name Karabakh. The eastern portion of Karabakh (roughly corresponding to Utik) lies on a lower and flatter surface, and has traditionally been called Lower Karabakh, while the western, mountainous portion (roughly corresponding to Artsakh) has been referred to as Mountainous, Upper, or High Karabakh. Nagorno-Karabakh in its modern borders is part of the larger region of Upper Karabakh.