The morphology of the stabilized surfaces of CdS _1-x Se _x crystals exposed to air at room temperature is studied by atomic force microscopy. The characteristic features of the relief of the natural faces of these crystals are described, and the causes of the appearance of these eatures are discussed. The morphological results are related to the results of the microcathodoluminescence study of surface micro- and nanostructures. This study revealed objects that contribute to exciton emission and, hence, are CdS _1-x Se _x solid solutions.