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Rock glacier hydrology remains poorly constrained in marginal permafrost environments such as the Southern Carpathians. This study quantifies spatial variability by relating spring temperatures to elevation, aspect, lithology, and spring type, and temporal variability through diurnal and seasonal thermal amplitudes, to detect permafrost occurrence and assess its influence on alpine groundwater systems. Between 2020 and 2025, 62 alpine springs were systematically monitored in the highest sector of the Retezat Mount...