Here are two more axes.
The first is an axe from the Nupe-tribe in Nigeria. It's a big one : length of handle is 58 cm (23,2 inches) and the blade measures 36 cm (14,4 inches).
The second one is a small dance axe used by the following tribes : Chamba, Mumuye, Mambila, Idoma, Montol. All living in the area North Nigeria/Cameroon. Forged in one piece.
Vandoo, about your last axe. I don't think it's from Congo. According to (my humble) opinion it's from Tansania (Luguru and/or Zaramo-tribe).