All the following are important timber producing countries in Africa except

Mauritania is not an important timber producing country in Africa. Ghana, Cote d'Ivoire, and Nigeria are all well-known for their timber production industries. These countries have large areas of forested land and are able to produce a significant amount of timber for domestic use and for export to other countries. Mauritania, on the other hand, is mostly covered by desert and does not have as much forested land as the other countries listed. While Mauritania may have some small-scale timber production, it is not a significant player in the African timber industry. In summary, Ghana, Cote d'Ivoire, and Nigeria are important timber producing countries in Africa, while Mauritania is not known for its timber production.