The historical-archoelogical monument belonging to the beginning of the 3-1 millennium B.C., in both banks of the Alinjachay, in the North of Gazanchi village of Julfa region. The fortress is connected with the ancient and wide spread Kas Turks who inhabitted in our regions in the 3 millennium B.C. The fortress was exploded in 1985 by the Armenian engineers under the dam pretext. The left bank and right bank parts of the fortress are divided from each-other by means of deep valleys consisting of precipitious rocks; the right bank part is in the high coninshape hill form. According to the information there was a fortress enforced with the half-round towers in the top of the hill. The left bank of the monument consisted of two parts and was encircled with the precipitious rocks on either side. The remainders of the half-round towers remain. The fortress consists of multistep mighty defence system. There is a passage from one wall to annother.

The defence walls (the width 2-2,5 m) were built of hewed big stones of a perfect architectural style. Very likely, the Gazanchi fortress was the center of a large tribal community who lived in the Alinjachay valley at the beginning of the 2nd millennium B.C.

The discovered things - grey and pink colour clay pottery examples, stone labour tools, grinding stones and so on during the excavation in the Gazanchi fortress are characteristic for the Nakhchivan culture. The construction technique of the fortress wall is the same of the Oghlangala monument. The above ground materials accumulated from the Gazanchi fortress consist of the grinding stones, grey and pink colour clay pottery (pot, bowl, little pot type wares and others). The finds are kept in the History-Ethnographic Museum of Julfa region. The Gazanchi fortress is also connected with the name of Gazan khan, the head hero of the epos “Kitabi-Dada Gorgud”.