Z. V. Atayev
Dagestan State Pedagogical University, st. Jaragskogo, 57 Caspian Institute of Biological Resources of Dagestan Scientific Center of RAS, st. M. Gadjieva
Russian Federation

candidate of geographical Sciences, Professor of the Department of physical geography and geoecology, Pro-rector on scientific work of the Dagestan state pedagogical University; Professor of the Department of recreational geography and sustainable development of the Dagestan state University; senior researcher of the laboratory of biogeochemistry of the Caspian Institute of biological resources of Dagestan scientific center of Russian Academy of Sciences; phone: 89289611097; 

V. V. Bratkov
Moscow State University of Geodesy and Cartography, Gorokhovsky lane
Russian Federation

doctor of geographical Sciences, Professor, head of Department of geography of the Moscow state University of geodesy and cartography; phone: 89067864489 

M. I. Gadzhibekov
Dagestan State University, St. Dachadaeva 21
Russian Federation

candidate of geographical Sciences, Professor of the Department of recreational geography and sustainable development of the Dagestan state University; phone: 89285396125