Figure 4From: Mapping hotspots of malaria transmission from pre-existing hydrology, geology and geomorphology data in the pre-elimination context of Zanzibar, United Republic of Tanzania Variables describing the physical geography of Unguja, Zanzibar including (A) soil infiltration (including the location of streams and dolines) [ 41 , 46 ] , (B) land cover type (Zanzibar Water Authority), (C) SRTM elevation [ 47 ] and (D) slope angle. Back to article page