<![CDATA[The life of living beings depends largely on the river. Likewise, human life can not be separated from the river. Humans use the material in the riverbed, namely sand for building materials. Sand mining activities along the Luk Ulo River, Karangsambung Village are activities that take place continuously. If this is left unattended, sand mining activities will damage a river ecosystem that is a living place for biota communities including macrozoobenthos. On the other hand, macrozoobenthos have an important role in the sustainability of river ecosystems. Based on this, it is necessary to conduct research related to riverbed substrates and macrozoobenthos. This study intends to examine the composition of the riverbed substrate around the sand mining site, and examine the diversity and abundance of macrozoobenthos communities around the sand mining site. The survey method is the method used in this study. Selection of study objects through purposive sampling. The data are presented quantitatively and qualitatively. There are three stages to the study. These stages are extracting and preparing samples of riverbed substrates and macrozoobenthos, then identifying samples, and the last is the measurement of physico-chemical parameters. Sand mining activities on the Luk Ulo River, Karangsambung Village have changed the composition of the bottom substrate of the Luk Ulo River. The diversity and abundance of macrozoobenthos are reduced around the sand mining site with the most abundant at the site, namely the species Tarebia granifera and Melanoides sp. Around the sand mining site, the physical and chemical parameters of water, namely turbidity, and TSS, have the highest values compared to other points.]]>
