The article characterizes the glacial landforms of the mountain territory in the area of Chersky Peak on the Khamar-Daban formed by different-aged glaciers of different morphological types: Khamar-Daban, Severny and Chersky. On the territory of the latter, after field studies in 2024, glacial morphological complexes (GMCs) of four average altitudinal levels of kars and troughs of additional new local glaciers, comparable to similar glaciers with similar altitudinal levels in the Munku-Sardyk mountain massif (Eastern Sayan), were identified and described. Two hypotheses were put forward for the origin of these complexes: stadial retreat of the Chersky glacier and discrete increase of the regional snow line after the complete melting of the Chersky glacier.

The uranium, hydrogen, and oxygen isotopes of groundwater reveal different character of water-rock interaction processes in the Baikal rift system (BRS) structures that inherited the Main Sayan Rift Zone (GSZ) and developed in the adjacent Archean Sharyzhalgai block of the Siberian paleocontinent basement. For fresh cold groundwater of the upper hydrogeodynamic stage, in the Kultuk reservoir of the GSR zone, a two-component mixing model is substantiated, initially obtained for U and Sr isotopes and confirmed in the present work for H and O isotopes. Values δ²Н и δ¹⁸О increase with increasing dissolved silicon content. The trend of the lower hydrogeodynamic stage is represented by thermal waters of the Bauntovskaya depression, in which the values of δ²Н and δ¹⁸О decrease with increasing dissolved silicon content. The U-H-O-isotope systematics at the stations of hydrogeochemical monitoring of seismic threat in the BRS emphasizes the special importance of the geochemical characteristics of groundwater obtained for the spring of station 143A of the Kultuk test site. In the waters of this station, a higher activity ratio was determined ²³⁴U/²³⁸U (ОА4/8), than in groundwater of the GSR of the Kultuk reservoir. The geochemical characteristics of the waters of station 143A partially correspond to the geochemical characteristics of groundwater of the Kultuk reservoir in the GSR zone, and partially to the geochemical characteristics of groundwater of the northwestern coast of Baikal and the eastern coast of the Irkutsk reservoir. It is assumed that the groundwater of these areas includes a component of the deep water of the South Baikal Reservoir (SBR). The difference between the U-H-O-isotopic characteristics of the waters of the spring of station 143A and those of the ground waters of the Kultuksky polygon in the GSR zone is explained by the structural control of the outlet of this spring by the KBZhD arc fault, emplaced in the Archean Sharyzhalgai block of the edge of the Siberian paleocontinent, along the Obruchev fault. The decrease of OA4/8 values in the waters of spring 143A detected over time indicates that compression is increasing in the deep part of the arc fault at present. Continuation of this process may have catastrophic consequences - a large landslide into the South Baikal depression along the plane of the arc fault.

The high-mountain relief forms of the Munku-Sardyk mountain massif, caused by exogenous processes of different genesis, age and location, are systematized. Ancient: supraglacial of the pre-Oka and Oka times with a very long period of development; subglacial of the progressive stage of the Oka glacier; subglacial of the regressive stage of the Oka glacier, developed in the areas of relief development of the previous type; subglacial, developed on the periglacial relief of the first type, regressive, after thermal glaciations. Modern: nival-glacial, permafrost and erosion processes that fit (develop) within the vertical geocryological zonality of the regressive stage of glaciation: periglacial physical weathering and snowdrifts developing above modern glaciers and rock glaciers; glacial - within the development of modern glacial processes; solifluction; high mountain-ice; debris flows; permafrost-stone mountain streams and erosion activity of mountain rivers. The relief forms resulting from all the above processes are complicated by denudation-accumulative slope processes.