This study was conducted on the sediments of Benanga Reservoir, Samarinda, East Kalimantan. The purpose of the study was to determine the content and distribution pattern of heavy metal iron (Fe) in the sediments of Benanga Reservoir, as well as its potential as a contaminant that has an impact on the environment. Sampling was carried out by core drilling and determination of Fe content in sediment through laboratory analysis using the XRF method. The results of the analysis showed that the average content of Fe metal in the sediment deposits of Benanga Reservoir increased from the bottom layer (A) to the middle layer (B) and continued to the top layer (C). The Fe content in the sediments of Benanga Reservoir far exceeded the toxicity classification standards for heavy metals in sediments according to the USEPA standard (1977), so the distribution of “heavily contaminated” Fe contamination was spread throughout the sediment deposits of Benanga Reservoir. The controlling factors for the amount of Fe content in the sediment deposits of Benanga Reservoir are current dynamics, sediment texture, organic matter content, and sediment deposition velocity.
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