Semien Wollo (or North Wollo) is one of 10 zones of the Amhara Region of northern Ethiopia. It is bordered on the south by Debub Wollo (South Wollo), on the west by Debub Gondar (South Gondar), on the north by Wag Hemra, on the northeast by Tigray Region, and on the east by Afar Region; part of its southern border is defined by the Mille River. Its highest point is Mount Abuna Yosef. Its towns include Lalibela (known for its rock-cut churches) and Weldiya (also spelt Woldia).