Cluster analysis of land snail species composition of 12 limestone hills in and around the Kinta Valley of Perak, Peninsular Malaysia. Two clusters were identified: a northern (blue dots) and southern cluster (yellow dots). Green polygons with red boundary refer to major clusters of limestone hills in Kinta Valley identified based on the 2.5 km buffer analysis (i.e. at least 2.5 km from the nearest cluster/hills). Red dots indicate limestone hills not sampled in this study.