Ouagadougou (alternatively known as Ougadougou or Wagadugu) is the capital of the country of Burkina Faso (rather than the capital of "a city in Africa").
Minimal advertiser competition for misspelling, Adwords shows low competition and prices for more frequent spelling, country is not sufficiently advanced in international economic or tourist development to make alternative spelling valuable.
Could be of some worth if time was taken to develop domain, but then, if you are into doing that, it would make more sense to concentrate on an area or niche where you are more knowledgeable.