Nigeria is the most developed country in Africa, followed by Cameroon, and Tanzania is the most backward of the three, but it also has the best relationship with China. However, overall, the security situation in Africa is slightly poor, including climate and environment, except for some infectious diseases, and public security. Conservatively speaking, Tanzania may be relatively safe. The most serious is Nigeria, where there are terrorist organizations, so I personally suggest Tanzania or Cameroon. Generally speaking, the degree of economic development is inversely proportional to the security situation. Nigeria and Cameroon belong to West Africa and are adjacent to each other. Tanzania belongs to East Africa and has the worst economy.