The small country of Benin happens to have 9 confluence points, most of which were recently documented by my PCV friend Jim Rybarski. "Confluence Hunting" can be a tricky task when you're trailblazing in Africa bush, and documenting Benin involved some failed attempts for a couple sights. Problems include unexpected bodies of water, unreliable roads, unknown terrain, and trying to convince local motorcycle taxis to do the unreasonable (take you into the bush) for a reasonable price. Here is an index of Benin's confluence points.
One of the points happens to be not 40 km (as the crow flies) from my own Benin town, Nikki. You can get a 360 degree idea of the place here as well as get a synopsis of the couple attempts to locate the point. While I didn't personally make it to the point, I accompanied Jim in his first attempt, which on the day was eventually given up after a decent ammount of meandering in the bush and realizing reaching the target would mean walking in uncharted terrain at least 10km.