 This study investigated the relationship between the shape, size, and gradation of sandy soil and its shear strength. It found that angular-shaped sand particles enhanced shear strength compared to spherical, rounded ones. Corsair sand particles also improved shear strength compared to finer sand particles, as did well-graded particles compared to poorly graded ones. Additionally, a model was developed to predict shear strength based on six key features, mean particle size, uniformity coefficient, curvature coefficient, dry density, normal stress, and particle regularity. This article was authored by Farras Dagestani and Hassam Abul Naga.