The quantity and quality of organic carbon were studied in bottom sediments of two small, shallow, polymictic dam reservoirs located in SE Poland: Zalew Zemborzycki (ZZ) and Brody Ilzeckie (BI). Total content of organic carbon (C sub(org)), and its fractions have been determined. The maps of C sub(org) spatial distribution have been compiled. Wide ranges of sedimentary C sub(org) were noted as well as differences between two reservoirs in respect of its content and spatial distribution. The C sub(org) content in the sediments showed a longitudinal zonation pattern in the ZZ and a transverse one in the BI. The composition of sedimentary C sub(org) showed the highest percentage of the insoluble fraction followed by humus acid fraction and the lowest - hemicelluloses fraction. In the humus acid fraction, fulvic acids overbalanced humic acids.