For Wikipedians who think every important subject already has an article, this list of protected areas and species in Tanzania should be required reading. There are far too many redlinks on important subjects in African geography and ecology.
This was an accidental discovery last month when I noticed a redlink for the Thika River in Kenya. What's the Thika River? Is it important? Ran a Google search to find out, and the very first source noted that it supplies 80% of the drinking water to Kenya's national capital. So I started the article.
Now working on Jozani Chwaka Bay National Park, which isn't a very big article yet. Hoping to get it up to size within the five day window for consideration at "Did you know?" It's the only national park on the island of Zanzibar and it's home to the endangered Zanzibar Red Colobus monkey, which lives nowhere else in the world. It'll be exciting to grow this article: the sources are saying that the park is a successful endeavor in ecotourism where cooperative work with the local communities has led to habitat preservation and a rise in the monkey population, while revenue sharing from park entrance fees has given the villages schools, cleaner water, and health clinics.
Which is cool. And there are redlinks like that all over Africa waiting to be filled.