Lower Yemen (Arabic: اليمن السفلى) and Upper Yemen are traditional regions of the northern highlands of Yemen.[1] Northern Highlands and Southern Highlands are terms more commonly used presently.
The Sumara Mountains just south of the town of Yarim denote the boundaries of the two regions.[1] These two traditional regions also coincide with Gourchenour and Obermeyer's ecological zones. Major urban centers include Ibb and Taiz.