Maps: a Main localities on Mt. Oku and surrounding areas (= Oku Massif), including those sampled for amphibians. Dashed line indicates the boundary of the Kilum-Ijim Forest. The grey shaded area shows the Kilum-Ijim Plantlife Sanctuary government protected area. Road (solid lines) bisecting the Kilum-Ijim forest (dashed line) and larger urban centres (Belo, Fundong, Ibal) are also shown b forest cover indicated by white shading, from Hansen et al . (2013) (downloaded from https://earthenginepartners.appspot.com/science-2013-global-forest) c topographic map showing elevation.