Koko refers to a leaf of a wild plant which is one of the foods of the forest inhabitants of Central African Republic. In Central Africal Republic, the inhabitants of the forest area subsist on cassava, bananas, plantains, palm-nut-oil, forest caterpillars, and the Koko, while some inhabitants bring these foods to the capital (bagui) to sell at the market. Central Africans are mostly self-sufficient, growing their own staples (manioc, sorghum, peanuts, sesame, corn, and squash), supplemented by wild tubers, leaves, and mushrooms. Peanut oil is produced commercially. Most products in the stores are imported from other African countries, Europe, and Asia. Bangui is the capital of Central African Republic. The country lies at the center of Africa in a region where wooded grasslands adjoin dense rain forests and has an area of about 239,400 square miles (620,000 square kilometers). The capital, Bangui, originated at the site of a French military post established on the banks of the Ubangi River in June 1889.