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Tidal and non-tidal straits and seaways are challenging geological areas governed by current amplification generated by local oceanographic narrowing and providing uncommon sedimentary conditions. Although the growing interest on such systems due to their potential for production of renewable energy, strategic role for the transport industry, climatic impact on the interconnected basins and many more, straits and seaways lack accurate depositional models predicting their space-time sedimentary dynamics and evolution. This session is primarily aimed at defining the state of knowledge on the variety of sedimentary processes and distinctive depositional signatures of these systems. Secondly, it wants to provide a chance for stimulating discussions, idea exchanges and joint collaborations between sedimentologists, marine geologists, geophysicists, oceanographers and other researchers involved in the investigation of modern and ancient cases. After the opening of the key note of Robert W. Dalrymple (Queen’s University, Canada), talks and posters focused on recent breakthroughs, theoretical hydro-sedimentary modeling, interplay between tidal or oceanographic currents and other strait-related processes will be welcome. We also encourage presentations aimed at the re-examination of the recognition criteria of ancient straits in the rock record, the creation of static or dynamic facies-based models, and the discussion of present uncertainties or still unsolved aspects