The Gulf of Guinea is the northeasternmost part of the tropical Atlantic Ocean from Cape Lopez in Gabon, north and west to Cape Palmas in Liberia. Null Island, defined as the intersection of the Equator and Prime Meridian, is in the gulf.

Gabon, officially the Gabonese Republic, is a country on the Atlantic coast of Central Africa, on the equator, bordered by Equatorial Guinea to the northwest, Cameroon to the north, the Republic of the Congo on the east and south, and the Gulf of Guinea to the west. It has an area of 270,000 square kilometres (100,000 sq mi) and a population of 2.3 million people. There are coastal plains, mountains, and a savanna in the east. Libreville is the country's capital and the largest city.