Savannah



A savannah is a grassland ecosystem characterized by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground to support an unbroken herbaceous layer consisting primarily of grasses. Savannas are also characterized by seasonal water availability, with the majority of rainfall confined to one season; they are associated with several types of biomes, and are frequently in a transition zone between forest and desert or grassland. It is often believed that savannas feature widely spaced, scattered trees. However, in many savannas, tree densities are higher and trees are more regularly spaced than in forest.