The miombo forests constitute an open wooded savanna that stretches from Angola in the west to Mozambique in the east and from Tanzania and southern Congo in the north to Zimbabwe in the south. They are distinguished by the presence of legume trees belonging to the genera Brachystegia, Julbernardia, and Isoberlinia. The Miombo covers 80% of Zambia occurring on sandy soils. Dambos cover some 20% of Zambia and occur on clay soils that flood during the wet season preventing tree growth. Dambos are grazed by cattle and burned annually. The miombo understory is burned ~ every two years and the trees are resistant to low intensity fire.