Diyala River
The Diyala River (Arabic: ; Sîrwan; Farsi: , ) is a river and tributary of the Tigris. It is formed by the confluence of Sirwan river and Tanjaro river in Darbandikhan Dam in the Sulaymaniyah Governorate of Northern Iraq. It covers a total distance of . It rises near Hamadan, in the Zagros Mountains of Iran. It then descends through the mountains, where for some 32 km it forms the border between the two countries. It finally feeds into the Tigris below Baghdad. Navigation of the upper reaches of the Diyala is not possible because of its narrow s, but the river's valley provides an important trade route between Iran and Iraq. The river flows southwest of the Hamrin Mountains. Its Aramaic origin is "Diyalas" and in Kurdish it is called "Sirwan", meaning 'roaring sea' or 'shouting river'. In early Islamic period, the lower course of the river formed part of the Nahrawan Canal. The Diyala Governorate in Iraq is named after the river. The river is mentioned in Herodotus' Histories under the name Gyndes, where it is stated that the king Cyrus the Great dispersed it by digging 360 channels as punishment after a sacred white horse perished there. The river returned to its former proportions after the channels disappeared under the sand. The Battle of Diyala River took place in 693 BC between the forces of the Assyrian empire and the Elamites of southern Iran. In March 1917 the British Empire defeated the Ottoman Empire at the confluence with the Tigris, leading to the Fall of Baghdad, part of the Mesopotamian Campaign of World War I. This area flourished already during the Jemdet Nasr and Early Dynastic periods, through to the Akkadian period. During the Larsa period, Eshnunna especially became prominent. Major excavations were done in the lower Diyala river basin in the 1930s. They were conducted by the University of Chicago Oriental Institute (1930–1937) and by the University of Pennsylvania (1938–1939). The sites such as Tell Agrab, Tell Asmar (ancient Eshnunna), Ishchali (ancient Neribtum), and Khafaje (ancient Tutub) were excavated.
