Аннотация:The present study of the permafrost exposed at the Sobo-Sise Yedoma cliff provides acomprehensive cryostratigraphic and organic matter inventory. It gives insight into permafrostaggradation and degradation over the last about 52 thousand years and into their climatic andmorphodynamic controls on regional-scale permafrost dynamics of the Central Laptev Sea coastalregion in NE Siberia. The Sobo-Sise Yedoma cliff is one of the fastest eroding permafrost featuresarctic-wide and releases considerable amounts of organic matter into the Lena River.