Abstract: Gully erosion has been identified as a significant source of sediment in the seasonally dry tropical savannas of the Burdekin catchment with the upper Burdekin subcatchment having the highest incidence of gullies. A simple method of calculating changes in gullied areas is provided. A 22% expansion of one gully network over a 58-year period was calculated using a time series of aerial photographs and satellite imagery. This work supported by mid-19th century explorer diaries clearly indicates that gully erosion in this area commenced well before the introduction of domestic livestock in the 1860s. The need for wider-scale quantification of gully erosion is also highlighted.