Detailed soil maps are crucial for sustainable management, but current maps lack reliability. A new method was used to improve accuracy by interpolating subsurface soil properties. The study focused on the Chalous region, using geomorphic surfaces and subsurface characteristics to create detailed soil maps. Six key soil properties were mapped and combined to produce a final soil map. Grid sampling and variograms were used to assess variability and spatial structure. The study found that this new approach increased the accuracy of soil maps in the region, especially in highlands with diverse ecosystems influenced by slope direction.