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An interdisciplinary study (cartographic and historical records, geomorphological, geological and bathymetric survey, water analysis, sediment coring and analysis and AMS radiocarbon dating) of two small and previously unreported lakes (Iezer and Bolătău) in Obcina Feredeului Mountains, northeastern Romania, provides new data into the environmental history and possible human impacts over the last millennium in this region. The first recorded historical reference to Iezer Lake dates to 1594 AD, and to Bolătău Lake to 1806 AD. Two sediment cores (420 cm for Iezer and 540 cm for Bolătău) of finely banded lake sediments and a radiocarbon age estimate at Iezer Lake suggest that this lake may represent the oldest landslide lake in Romania. The geomorphological, geological, and morphometric surveys indicate that these lakes' origins relate to landslide activity. Coarse grained, lighter sediment bands are …