A multi-proxy investigation (loss-on-igni- tion, major and trace elements, pollen, plant macro- fossil and siliceous algae) was carried out on the sedimentof acrater lake (Lake Saint Ana,950 ma.s.l.) fromtheEasternCarpathianMountains.Diatom-based transfer functions were applied to estimate the lake’s trophic status and pH, while reconstruction of the water-depth changes was based on the plant macro- fossil and diatom records.