English: Extract of Thomson’s map (1817), on which the border between Tigray (yellow) and Dembea/Gondar (magenta) runs at the southern edge of the main reliefs of the Semien mountains – note the Devarek (Debark) salient on the Gondarine plateau in contrast to the surrounding rugged “Samen” terrain , part of Tigray. Walkayt (in orange colour) appears as independent both from Gondar and from Tigray. Similar boundary courses are also displayed on most other maps prepared in that period (Salt 1814, Brué 1828, Arrowsmith 1832, Brué 1834, Weiland 1841, Arrowsmith 1844, Radefeld 1844, Andriveau-Goujon 1850). Map credit: David Rumsey Map Collection, David Rumsey Map Center, Stanford Libraries. The map displays boundaries of political control, which may locally be different from lines of language transition. This map extract is conformably oriented with north up and approx. 450 km wide. Published in: Nyssen, J., Biadgilgn Demissie, 2023. Administrative and ethno-linguistic boundaries of Western Tigray (Ethiopia) since 1683. Journal of Maps, 19 (1): 2257249. DOI: 10.1080/17445647.2023.2257249.