This package contains input data and results of a sinkhole susceptibility analysis conducted along the RETURNLAND coastline. Input data include sinkhole clusters (available as shapefiles and CSV files), metadata of predisposing factors, and the related raster layers (coastline density, cover thickness, geolithology, relative slope position, slope, and topographic wetness index), for both phases. Coastline data include MIS 5 paleo shorelines (training phase) and projected future coastline scenarios (projection phase). The results folder contains detailed information on the analysis performed, including model validation outputs and the resulting susceptibility maps.