The accumulation of plastic debris in the environment is an increasing concern. Besides the direct negative effects on human livelihood and (aquatic) ecosystems, land-based plastics are also considered the dominant source of ocean plastic pollution. The understanding of the fate and transport of (micro)plastics within freshwater and terrestrial environments is still at an early stage. In this session, we invite contributions that focus on the study of plastics in freshwater, terrestrial and oceanic systems including, but not limited to: Plastic detection and monitoring techniques; (Long-term) monitoring efforts Source and (bio) accumulation investigations; Transport processes; Prevention, mitigation and reduction; Outreach and stakeholder involvement efforts; We welcome studies focused on all sizes (macro, micro and nano), geographic areas and ecosystems (land, freshwater, estuary, ocean).