The current glacial retreat in the northern Antarctic Peninsula region is activating the hydrological
system. The study of the dynamics of such system is important considering the impact of water and matter
flows on ecosystems. In the case of lakes it is important to know their connection to the surface and
underground flow. Analytical models, as the proposed by Redozubov (1966), predict for large lakes the
presence of taliks with a direct connection to the aquifers below the permafrost, estimating positive
temperatures (1.49ºC) in the talik coldest part. However, hydrochemical analysis (SO4
2-/Cl- relationships)
of one of the deepest lakes in the studied region - Esmeralda Lake in Cape Lamb, Vega Island - and of the
groundwater around it seems indicate that doesn’t exist such connection. This has been confirmed
considering the temperatures of the water and sediments of the lake, recommending that the predictions
of such analytical model must be checked in the field