The Zab River is a significant waterway in the Middle East, primarily flowing through northern Iraq and parts of Iran. It is a tributary of the Tigris River, contributing to the region's water supply and supporting local agriculture. The river is approximately 400 kilometers long and is known for its scenic landscapes and diverse ecosystems. The Zab River has two main branches: the Great Zab and the Little Zab. The Great Zab originates in the Zagros Mountains of Iran, while the Little Zab flows from the same mountain range but is shorter. Both branches play a crucial role in the hydrology of the area, providing water for irrigation and sustaining wildlife.