Page "History of Equatorial Guinea" Paragraph 4

The mainland portion, Río Muni, became a protectorate in 1885 and a colony in 1900.

Conflicting claims to the mainland were settled in 1900 by the Treaty of Paris, and periodically, the mainland territories were united administratively under Spanish rule.

Between 1926 and 1959 they were united as the colony of Spanish Guinea.