During the era of the Ottoman Empire, mapmakers outside the Empire referred to the mountainous plateau in eastern Anatolia as Armenia. Other contemporary sources called the same area Kurdistan. Geographers have variously used the terms East Anatolian Plateau and Armenian Plateau to refer to the region, although the territory encompassed by each term largely overlaps with the other. According to archaeologist Lori Khatchadourian, this difference in terminology "primarily result from the shifting political fortunes and cultural trajectories of the region since the nineteenth century."