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Tropical cyclones that swept across South Sakhalin and the southern part of the Kuril Islands in early October of 2015 produced strong winds and heavy precipitation. They resulted in large-scale windthrow patches in zonal dark-conifer forests do minated of Abies sachalinensis and Picea jezoensis, as well as secondary forests of va­ rious­composition.­We­identified­the­distribution­of ­these­windthrows,­estimated­ their area, and assessed the total wood biomass loss. Forest change area and wood bio mass data by Global Forest Watch project was used for the analysis. Through com pa rison examination of these data with satellite images of very-high resolution we established that windthrows located on Sakhalin Island are recognized with high­accuracy,­while­their­area­on­the­Kuril­Islands­is­presented­significantly­lower­ than the area of actual damages. We recommend using methods of higher precision­level­for­future­windthrow­identifications­on­the­Kuril­Islands.­The­total­area­ of windthrows on Sakhalin was calculated at 425.98 km2 with the wood mortality of 4.72·106­ tons.­We­found­no­significant­correlation­between­windthrow­patch­ dis tribution and local topographic conditions such as elevation above sea level and slope gradient. At the same time, forests growing on slopes with western exposure on Sakhalin Island revealed greater damage which is correlated with the wind direction during the disturbance events. K e y w o r d s : windthrow, forest disturbance, forest loss, tropical cyclone, typhoon

The first record of catastrophic windthrow in boreal forests of South Sakhalin and the South Kurils (Russia) during October 2015 tropical cyclones