Which three nations did the tigris and euphrates rivers flow

The rivers "Tigris and Euphrates" flow through three nations Eastern Turkey, Syria, Iraq.

Explanation:

The rivers Tigris and Euphrates form the major river system in "Western Asia". The two rivers originating in Eastern Turkey in the "mountains of Eastern Anatolia", descend through valleys to the lands of "Syria and Northern Iraq". This leads to the "alluvial plains of central Iraq". The rivers through the central plains combine and get into the "Persian Gulf". The ecoregion with two rivers is described as the ‘Cradle of Civilization’ known to be the first emerged civilization.

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor: