Portugal ceded its rights to bioko and the nearby island of annoban to spain in 1778 1778年葡萄牙将比奥科及其附近的安诺本岛划归西班牙势力范围。
2.
In july 1959 spanish guinea was divided into two overseas provinces of spain : rio muni ( now mbini ) , on the african mainland , and the island of bioko with other nearby islands 1959年被划分为西班牙的两个海外省：位于非洲大陆的姆比尼地区为1个省，比奥科岛及附近岛屿组成另1个省。
