Guinea, Equatorial Guinea, Ghana, and Guyana. Often confusing in both geography and pronunciation. First, here's an online thread that tries to answer the question "Why are so many countries named "Guinea"? And, if you have advice on how to pronounce each country, post it in the comments below!
Anyway, here's a bit of a primer (mostly compiled from Wikipedia entries):
The Republic of Ghana (map) is a country located in West Africa. It is bordered by Côte d'Ivoire (Ivory Coast) to the west, Burkina Faso to the north, Togo to the east, and the Gulf of Guinea to the south. The word Ghana means "Warrior King” and derives from the Ghana Empire.
Guinea (map) (officially the Republic of Guinea French: République de Guinée), is a country in West Africa. Formerly known as French Guinea (Guinée française), it is today sometimes called Guinea-Conakry to distinguish it from its neighborGuinea-Bissau.
The Republic of Guinea-Bissau (map) is also in West Africa. It is bordered by Senegal to the north, and Guinea to the south and east, with the Atlantic Ocean to its west.
Equatorial Guinea (map), officially the Republic of Equatorial Guinea is a country located in Central Africa.
New Guinea (map), the largest island in the Indonesian archipelago, and located immediately north of Australia in the Southwest Pacific, is theworld's second largest island.
Papua New Guinea (map), officially the Independent State of Papua New Guinea, is a country in Oceania, occupying the eastern half of the island of New Guinea and numerous offshore islands (the western portion of the island is a part of the Indonesian provinces of Papua and West Papua).
Guyana (map), officially the Co-operative Republic of Guyana and previously known as British Guiana, is a state on the northern coast of South America that is culturally part of the Anglophone Caribbean.
French Guiana (map) (French: officially Guyane) is an overseas region of France, consisting of a single overseas department located on the northern coast of South America.