Fig. 2From: Ground subsidence and polygon development due to thermokarst in the Lena-Aldan interfluve, eastern Siberia, revealed by satellite remote sensing dataStudy area. a Elevation, towns (stars) and an observation site by Melnikov Permafrost Institute (dot) in the study area close to Lena River; b Map of terraces distinguished by Soloviev (1959); c Elevation along the Amga River around Amga and towns (stars)Back to article page