The Gwembe Valley is formed by the Zambezi River as it cuts across southern Africa. The valley forms the boundary between Rhodesia and Zambia. In the late 1950's a dam was built on the lower Zambezi, just below the valley, forming Lake Kariba. Due to the permanent flooding of their traditional farmlands, the Valley Tonga were relocated. Although their traditional way of life was forever disrupted, the data collected by the anthropologists sent in to assess the impact of the relocation, as well as the causes of endemic famine in the area, forms the basis of this simulation.