Mainly Turkey and part of western Mesopotamia
In The Bible it is mentioned as one of the four rivers that proceeded out of the Garden of Eden.
That is from http://www.lycos.com/info/euphrates--euphrates-river.html
The earliest references to the Euphrates come from cuneiform texts found in Shuruppak and pre-Sargonic Nippur in southern Iraq and date to the mid-3rd millennium BCE.
The Tigris river and The Euphrates river
The Euphrates River has three main shared tributaries: the Sajur the Balikh/Jallab The Khabour
the medeturanian sea was the river that formed the Tigris and Euphrates rivers
thare will be a stupid fish
The Tigris and Euphrates river valley.
Turkey
The Euphrates is in Iraq.
Turkey
The river that is in Iraq and near to the Tigris River is the Euphrates. This river begins in Turkey and flows through Syria and across the country of Iraq. It also unites with the Tigris River to eventually empty into the Persian Gulf.
The Euphrates is the longest river in Southwest Asia and flows through Syria, Iraq and Southern turkey.
Iraq
Turkey
Euphrates River
Turkey
The Euphrates River
europe
The river that runs through Turkey, Syria, and Iraq is the Euphrates River.