This country's mainland portion is known as  ► Rio Muni, but its capital is located on the island of Bioko.
Adam Roberts's book The Wonga Coup is about a "ruthless determination to create mayhem" in this country, which generated a scandal implicating the son of Margaret Thatcher. The islands of Corisco and Annobon belong to this country, which is home to an island that was the colony of (*) Fernando Po. The only mainland African country with Spanish as a de jure official language, its largest city is Bata. This country's mainland portion is known as  ► Rio Muni, but its capital is located on the island of Bioko. Nearly surrounding Sao Tome and Principe and bordered by Gabon and Cameroon, for 10 points, name this central African nation, with capital at Malabo, named for its proximity to a certain line of latitude.
Adam Roberts's book The Wonga Coup is about a "ruthless determination to create mayhem" in this country, which generated a scandal implicating the son of Margaret Thatcher.
Equatorial Guinea