SCShores: A comprehensive shoreline dataset of Spanish sandy beaches from a citizen-science monitoring program

. Sandy beaches are ever-changing environments, as they experience constant reshaping due to the external forces of 15 tides, waves, and winds. The shoreline position, which marks the boundary between water and sand, holds great significance in the fields of coastal geomorphology, coastal engineering, and coastal management. It is crucial to understand how beaches evolve over time, but high-resolution shoreline datasets are scarce, and establishing monitoring programs can be costly. To address this, we present a new dataset of shorelines for five Spanish sandy beaches, located in contrasting environments, derived from the CoastSnap citizen-science shoreline monitoring program. The use of citizen science is an increasingly strong 20 current within environmental projects that allows both community awareness and the collection of large amounts of data that are otherwise difficult to obtain. This dataset includes a total of 1721 individual shorelines composed of points every 3 m-spaced points alongshore, accompanied by additional attributes, such as elevation value and acquisition date, allowing for easy comparisons. Our dataset offers a unique perspective on how citizen science can provide reliable datasets that are useful for management and geomorphological studies. The shoreline dataset, along with relevant metadata, is available at 25

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