20 wide Bwa mask. The Bwa Tribe occupies large areas of Mali and Burkina Faso, extending from the banks of the Bani River in Mali in the north, almost to Diebougou and the Ghana/Burkina border in the south. The Bwa have produced different types of wooden masks that portray human and animal characters with dramatic abstracted features and brightly colored geometric designs worked onto the surface of their masks.