This dataset is a map of the average yearly total biomass (aboveground) in metric tons per hectare using the observed climatic variables (i.e. precipitation, minimum & maximum temperature, and solar radiation) from 2001 to 2010. It covers the Central Slopes NRM region. Intended for use at catchment scale, this raster dataset has a cell size of 90m x 90m. The modelling work was done using the Soil and Water Assessment Tool (SWAT).