This article describes an unusual source—the “Draft of the Land of Fort Narym” from the “Sketchbook of Siberia” by Semen Remezov. This is a spatial-graphic model, rendering late 17th-century realities in a conventional schematic manner. It covers the Narymsky and Ketsky uyezds (currently, northern Tomsk Region, known as Narym Territory). The encoded information relates to the history, geography, ethnography, settlement, and infrastructure at this territory in the late 17th century. One of the features represents elevations. We discuss its accuracy and relevance to the history and culture of the Narym Territory, and outline the ways of solving related problems. To render elevations, the cartographer used two types of conventional signs: those actually representing mountains and ranges, and thick lines. We conclude that “mountains” on the draft refer to real geographic features of the Narym Territory, described by 17th–19th century travelers and scholars and by the local oral tradition, and supported by modern geographical records. S.U. Remezov represented elevated areas with reference to their practical meaning for Russian reclamation.