Africa's landscape features several large river basins that drain rainwater into long rivers like the Nile. However, many rivers are not navigable for transportation due to waterfalls and rapids. Notable geographic features include Victoria Falls, the largest waterfall in the world, and the Great Rift Valley. Africa has abundant natural resources like minerals and oil, but political instability and lack of infrastructure have hindered economic development and led resources to be exported uneasily. New diamond manufacturing technologies threaten to disrupt the traditional diamond industry.