The Great Zab is a significant river in northern Iraq, flowing through the Zagros Mountains and eventually joining the Tigris River. It is approximately 400 kilometers long and plays a crucial role in the region's agriculture and water supply. The river's basin supports various ecosystems and is vital for local communities. Historically, the Great Zab has been important for trade and transportation. It has also been a site of various ancient civilizations, contributing to the rich cultural heritage of the area. The river's waters are essential for irrigation, helping to sustain farming in the arid landscape surrounding it.