Özet:

This paper aims to present the results of the underwater research conducted by the author and researchers from Istanbul Technical University Fine Arts, Geology and Geophysics Departments on the Elazığ Hazar Lake and submerged medieval settlement located on its southwest. This study is an important example of medieval architecture and ceramics belonging to a region that has not been sufficiently investigated in Upper Euphrates region in Eastern Anatolia. The information about the sunken settlement of the Hazar Lake-Elazığ, can be compiled from the legends, georaphers' analysis and the books written by travelers. However, the lack of prior archaeological researches belonging to the area, restricts the literature on this subject. Through this study, the submerged settlement surrounded by the city walls are investigated and the measured drawings are prepared. This settlement is an unique example for  the usage of all brick construction technique which can be observed through the cicuit walls and towers. It is understood from various sources written by travelers that this settlement had been used for ecclesiastical purposes in 11-12 th centuries becoming the seat of the Armenian catholicos. Due to the landslide on the Kilise (Church) Island which is located to the north of the submerged area, ceramic fragments of various periods are found together. Some of the ceramics that we may have belonged to the 11th- 13th centuries and the 19th century. ceramics point to the long history of this place. A part of the defense walls could to be dated to back till 6th century. The reason of the submergence of the settlement is accepted as the fact that its location over the active full line. The signs of earthquakes and the restorations are also observed over the structures under water. Elazığ Hazar Lake has a noticeable touristical potential for Eastern Anatolia. The archaeological heritage is under danger because of its vulnerable character. This Project is a contribution to document the underwater area from all aspects. It also fills a lack about medieval architecture in the Eastern Anatolia and contributes our knowledge about the relation between Byzantine and Turkish forces after 11th century.