リオ・ムニ
Río Muni was ceded by Portugal to Spain in 1778 in the Treaty of El Pardo. The Spanish had hoped to collect slaves to work in their other overseas possessions, but their settlers died of yellow fever and the area was deserted. Cocoa and timber became major industries upon recolonization. Río Muni became a province of Spanish Guinea along with Bioko in 1959.