Geological discontinuities play a significant role in the assessment of rock slope stability. Rock slope stability has been studied on the main road between Sulav and Amadiyah resorts in Duhok governorate on the southern limb of Mateen anticline, to determine the expected rockslides on this road. Five stations were chosen to study these rockslides that may occur on these steep slopes. All these stations were within the Pila Spi Formation that consists of hard dolomitic limestone and covering the areas from Sulav resort towards Amadiyah district with a length of up to 2.5 km. The stereographic analysis was used to study and classify the stability of these slopes. The analysis showed in all stations the possibility of plane sliding to happen on the bedding plane, and the wedge sliding between the bedding plane and planes of all joint sets, as well as the occurrence of rockfall on some stations.