Nagorno-Karabakh is a landlocked region in the South Caucasus, lying between Lower Karabakh and Zangezur and covering the southeastern range of the Lesser Caucasus mountains. The region is mostly mountainous and forested. Most of the region is governed by the Nagorno-Karabakh Republic, a de facto independent but unrecognized state established on the basis of the Nagorno-Karabakh Autonomous Oblast that was part of the Azerbaijan SSR in Soviet Union. Azerbaijan has not exercised political authority over the region since the advent of the Karabakh movement in 1988. Since the end of the Nagorno-Karabakh War in 1994, representatives of the governments of Armenia and Azerbaijan have been holding peace talks mediated by the OSCE Minsk Group on the region’s disputed status. The region is usually equated with the administrative borders of the former Nagorno-Karabakh Autonomous Oblast comprising an area of . The historical area of the region, however, encompasses approximately .