The article describes about the current state of glacial lakes in the northern part of the Teskey and in the southern part of the Kungoy Ranges. In study, we used new satellite images with a high resolution applying by Remote Sensing methods and fieldwork. The number of glacial lakes in Teskey Range is five folds more than in Kungoy Range. The majority of glacial lakes are in small sizes (80%) and domi-nated in both Ranges. We found that, the villages located in the downstream of Ton, Jyrgalan, Ukok and Tyup Rivers of Teskey Range have high vulnerability to risk. However, in Kungoy Range, the vulnerability in downstream villages are very low. Our research confirmed that, the drainages of glacial lakes depend on several geomorphological factors, such as: the inflow of glacial meltwater into lake-basin, the condition of ice-tunnel, the structure of the lake-dam and debris covered dead-ice. In conclusion, in order to mitigate risks and prevent possible disasters, in the downstream villages given several suggestions to solve such problems.
