The answer is Tigris
Step-by-step explanation:
The Akkadian Empire was an empire in Mesopotamia from 2334 to 2154 BC, this empire is considered as one of the earliest in history and developed in the region of Akkad that is along the Euphrates and the Tigris rivers in the Middle East. This empire conquered neighbor territories controlling part of Mesopotamia, Iran, and the Levant, also due to this, the Akkadian Empire integrated different human groups including the Sumerians that were located in the same region. Considering this, it can be concluded the Akkadian Empire developed along the Euphrates and the Tigris Rivers.