“Russian archeology” is a trend that is becoming increasingly popular in Siberia. Of particular interest is the period of the initial colonization of Siberia. In the Middle Ob region it is known more than a dozen towns and forts, founded at the end of the XVI and in the XVII century. Three of them - Narym, Ket, Kungop were located on the banks of the Ket river, the vast basin of which connected Western and Eastern Siberia in the XVII-XVIII centuries. The circumstances and even the foundation dates of these fortified points due to the lack of sources are reconstructed with great difficulty. The Narym fortified town, which became the forerunner and the most important strategic point of the Russian development of the Narym Territory, has been "forgotten" by historians in recent decades. This is due to the limited available written sources, the overwhelming majority of which were introduced into scientific circulation by G.F. Mueller and P.N. Butsinsky. Although the potential for expanding the “written” base has not been drained, the most promising is the shift of emphasis towards local-historical and local-geographical research, based on a comprehensive analysis of sources of different types, including usage of the archaeological experience of studying the Russian time objects. The author implements this approach in solving the problem of the location determining of the first Narym fortified town. There is no doubt that this fortified point localization, as well as its archaeological study, will provide specialists with a body of new sources needed to recreate the exploration of the Narym Ob region. The area of probable location of the first Narym fortified town is outlined in the article based on the correlation of written evidence, cartographic materials, features of the natural-geographical situation of the Narym Ob region.