Page "County of Edessa" Paragraph 1

Unlike the other Crusader states, the County was landlocked ; it was remote from the other states and was not on particularly good terms with its closest neighbor, the Principality of Antioch.

Half of the county, including its capital, was located east of the Euphrates, far to the east of the others, rendering it particularly vulnerable.

The part west of the Euphrates was controlled from the stronghold of Turbessel.