This dataset is produced for the STRASA project in which breeders are developing varieties tolerant to iron toxicity. The intended use is that tolerant varieties can be sent to places with high risk of iron toxicity. This "iron soils" map was combined with three crop maps (GAEZv3, MIRCA2000,SPAM2005) and multiplied with country specific fractions rainfed lowland rice from Diagne et al. (2013) because iron toxicity occurs predominantly in poorly drained rainfed lowland rice soils and rarely in upland or irrigated rice.