Samsat, formerly Samosata is a small town in the Adıyaman Province of Turkey, situated on the upper Euphrates river. It is the seat of Samsa…Samsat, formerly Samosata is a small town in the Adıyaman Province of Turkey, situated on the upper Euphrates river. It is the seat of Samsat District. The town is populated by Kurds of the Bezikan tribe.