What significant rivers were part of the Persian empire?

The Persian Empire, at its height, encompassed several significant rivers that were crucial for its agriculture and trade. Notable among these were the Tigris and Euphrates rivers, which flowed through Mesopotamia, and the Indus River in the eastern territories. Additionally, the Oxus (Amu Darya) and Jaxartes (Syr Darya) rivers were important in the northern regions of the empire. These rivers not only supported the empire's economy but also facilitated cultural exchange and communication across vast distances.