Detailed facts only in the guide books. The U.S. State Department files travel information and warnings for all countries, world wide. Their annually updated pages contain a short description of the country and useful information about safety, crime rate, health services and insurance. Aimed at U.S. citizens, but useful for anybody. Go directly to their Chad Page .
Guides exist to all countries.
You might want to go to their Africa Page . Also a German entry . You won't find too much information, but they have detailed maps of the country. Texts and graphics may be reproduced freely, under the condition that their origin is clearly referred to, see Conditions .