The main objective of this research is an examination of the applicability of the QUAL2K mathematical model on large rivers like the Euphrates, and it is the first study of its kind conducted on this important section within Fallujah Euphrates Reach (FER), using this model for the purpose of evaluating the quality of water and creating a database to predict the quality of river. After 85 km from the dam, the river enters the Mesopotamian Plain, between Hit town and Ramadi city (Fig. Many large valleys merge into the river flowing from the Iraqi Western Desert, like Hauran, which is the largest valley in Iraq ( Sissakian et al., 2017 B), Al-Asadi, Al-Mahamidiyat. The Euphrates River flows out of Haditha Dam Reservoir and continues flowing in a rocky terrain with a trend of almost N -S. The river continues flowing in a rocky terrain until it crosses Ana Mountain, and then changes its trend to NNW -SSE until it enters into Haditha Dam Reservoir. A dense network of valleys from the south drain the Western Desert into the river (Fig. The valley of the Euphrates River runs through a rocky terrain, to the south is Ana Mountain, an outstanding morphological feature in the Iraqi Western Desert whereas to the north is Al-Jazira Plain with undulatory and rolling landscapes, the trend of the river is almost W -E (Fig.
The flood plain is wide with many acute meanders, some of them form abandoned ox bow lakes (Fig.
Euphrates River enters from Syria into the Iraqi territory in the central western part (Fig.
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