Abstract
The study aimed to correlate the principal soil types and subtypes of the Kostanay Region of Kazakhstan with the World Reference Base for Soil Resources (WRB) and to provide a unified nomenclature suitable for international soil research. The analysis was based on regional soil maps, the National Atlas of the Republic of Kazakhstan, published studies on soil morphology and properties, and the fourth edition of WRB (2022). More than 30 national classification units and eight soil complexes identi