Limestone hills are prone to chemical weathering such as dissolution which causes the formation of karst terrains. They also exhibit extensive geological discontinuities due to past tectonic history and also physical weathering. Therefore, limestone hills can pose danger to properties and human due to instability of the slopes. Physical weathering causes the rocks to undergo stress which opens existing geological discontinuities such as fractures. These geological discontinuities are the main factor which causes slope instability and rock fall. The main objective of this study is to investigate the failure modes of six slopes in the limestone hills of Gunung Rapat, Ipoh, Perak, Malaysia. Based on the kinematic analysis conducted, plane failures were identified on slope M1, M2 and T3. Wedge failures were identified on slopes M2, T2 and T3. However, no failure was identified on slopes M3 and T1. Slopes M1, M2, T2 and T3 all have high susceptibility to failure due to the intensity of discontinuities and unfavorable joint orientations. © BEIESP.