In
Turkey's
Aegean Region, Gediz River's length is second only to
Büyük Menderes River whose flow is roughly parallel at a distance of slightly more than a hundred kilometers to the south. Gediz River rises from
Murat Mountain and
Şaphane Mountain in
Kütahya Province and flows through
Uşak,
Manisa and
İzmir Provinces. It joins the sea in the northern section of the
Gulf of İzmir, close to the gulf's mouth, near the village of Yenibağarası in
Foça district, south of the center of the district. The Gediz Basin lies between northern latitudes of 38°04’–39°13’ and southern longitudes of 26°42’–29°45’. It covers 2.2% of the total area of Turkey. Larger part of the alluvial plain called under the same name as the river (
Gediz Plain) is within the area of Manisa Province and a smaller downstream section within İzmir Province. ==Environmental issues==