The northern portion of the region between the Tigris and Euphrates rivers is known today as Upper Mesopotamia. The area, extending from the mountains of eastern Anatolia in the north to the Tharthar Depression (northwest of Baghdad) in the south, is an alluvial plain that formed an important crossroads region in the ancient and medieval periods. Major settlements of the region in the early Islamic period include Ar-Raqqah and Edessa.
Gabriel Mckee,
and Jeffrey Becker,
'al-Jazirah (region): a Pleiades place resource',
Pleiades: A Gazetteer of Past Places,2023
<https://pleiades.stoa.org/places/199032881> [accessed: 28 January 2023]
{{cite web |url=https://pleiades.stoa.org/places/199032881 |title=Places: 199032881 (al-Jazirah (region)) |author=Mckee, G. |accessdate=January 28, 2023 4:42 am |publisher=Pleiades}}