Most of the nation has savanna-type vegetation—grasslands interspersed with trees. Teak forests are in the southwest. Animals include elephants, lions, rhinoceroses, and several varieties of antelope. Of overwhelming importance are the valuable mineral veins of the nation’s copper belt. The belt extends down into Zambia from southern DRC and contains major deposits of copper, cobalt, and other minerals. Zambia also has substantial hydroelectric potential. The Kariba Dam on the Zambezi River is the nation’s main power source. Zambia shares the Kariba system with Zimbabwe. Other stations on the Lunsemfwa and Mulungushi rivers serve Kabwe. Installations have also been built on the Kafue River. In 1999 the total output of electricity was 7.6 billion kilowatt-hours, nearly all of which was produced by hydroelectric plants.