An ecological-economic study was made within the framework of the overall assessment of the environment-forming services of geosystems in order to estimate the cost of the ecosystem service for carbon deposition by geosystems of one of the territories of traditional nature management in Nenets Autonomous Okrug situated in the coastal zone of the Arctic Ocean. Input data included published statistical and cartographic characteristics concerning the structure and areas of the study territory as well as observational data in scientific publications on carbon deposition in geosystems occurring in similar ecological-geographical conditions. As a result of assessment calculations, it was established that the cost of only one ecosystem service, namely, deposition turned out to be almost equal to the cost for the bio-production ecosystem which was analyzed earlier under the Global Ecological facility (GEF) project and is used for compensation of a loss of territories of traditional nature management of indigenous peoples living in the Arctic zone of Russia, as a result of the removal of lands for other types of nature management. Calculations served as the basis for compiling the map of the unit cost of the ecological service for carbon deposition based on the geobotanical map. It is determined that the preservation of pools of ecosystem services for territories of traditional nature management will permit them to perform important functions of mitigating unfavorable anthropogenic transformations of geosystems accompanying economic development of the Arctic zone of Russia.Keywords: ecosystem services, carbon deposition, mapping, Arctic, ecological buffer, development priorities.