Abstract: Tide-dominated and tide-influenced systems have been investigated for several decades, attracting the interest of many sedimentologists; nonetheless, these depositional systems remain poorly understood compared to their fluvial- dominated and wave-dominated counterparts. Interpreted tide-dominated successions show mismatches with their modern analogues when comparing grainsize, architectural elements, unit thicknesses and others. Sedimentary structures considered as “tidal indicators” can also commonly be found in non-tidal environments. Yet, they are often used as the only tool to infer a tidal origin for ancient systems, driving the development of misleading conceptual and applied models. During this seminar, I will show some examples of modern and ancient tidal systems, discussing some of the problems related to their investigation.