Soil erodibility in Switzerland was assessed using topsoil samples to create a map of erosion risk. By analyzing soil properties like texture and organic matter, researchers calculated the K-factor, a key parameter for soil loss rates. Including mountain soils in the study, they found that stone cover reduces erodibility by 8.2%. The new map accurately reflects erodibility in different regions, unlike previous estimates that overestimated erosion in mountains and underestimated it in valleys. This information is crucial for land use decisions, soil protection, and managing erosion risk in Switzerland.