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Rock magnetic methods have been used in environmental studies, including monitoring anthropogenic pollutions in the form of heavy metals in soils and sediments. Such environmental studies have never been carried out in river sediments from peatlands environment in the tropics. In this study, sediments from Martapura River were characterized for magnetic and heavy metal contents. Martapura River is a river that has a function as a source of PDAM (Regional Water Company) and its as a MCK (bath, toilet and wash) place for the community along the river. Considering that in South Kalimantan there are many mines which are indirectly related to the Martapura River and studies on the Martapura River surface sediments that are related to their magnetic properties and pollution have never been carried out, this research is important to do. Surface sediment samples were taken and measured by a magnetic measurements (magnetic susceptibility) and heavy metal contents (Atomic absorption spectrometer or AAS). The results show that surface sediments have low mass-specific magnetic susceptibility ​​varying from 196.0 to 415.0 × 10-8 m3kg-1 (on average of 231.0 × 10-8 m3kg-1) because influenced by the peatlands environment.The content of heavy metals contained in sediments such as Cu, Zn, Fe, Mn, Al, Na, Ti and Hg. The content of heavy metals in surface sediments that have exceeded the threshold of pollution are Fe and Mn.