Savannahs are grassland ecosystems that are characterised by small trees or trees that are widely spaced so as not create a closed canopy. The open canopy allows ample light to reach the ground to support an unbroken layer of grasses. Savannahs can be a transitional ecosystem as they separate desert or prairie from a forested area. Savannahs can be found in large areas of Australia, Africa and some places in South America,