Africa
From Halopedia, the Halo wiki
Africa is Earth's second-largest continent, after Asia. At about 30,221,532 km² (11,668,545 mi²) including adjacent islands, it covers 6.0% of the Earth's total surface area, and 20.4% of the total land area. The continent is surrounded by the Mediterranean Sea to the north, the Suez Canal and the Red Sea to the northeast, the Indian Ocean to the southeast, and the Atlantic Ocean to the west. There are 46 countries including Madagascar, and 53 including all the island groups.
Halo 2
In the Fall of 2552, the Covenant found Earth in search of an object. They landed only in one spot in the country of Kenya, in and around the city of Mombasa. The Prophet of Regret's forces tried to hold onto and capture the city from UNSC Forces, but failed. There his Flagship jumped into Slipspace. Between Mombasa and Voi is theorized to be the location of the Forerunner Ark.
Halo 3
After the Flood's invasion in Voi, the Elites glassed a portion of the continent. This stopped the Flood from spreading and consuming the entire planet. Lord Hood claims they glassed half the continent, but given his distaste for his former enemies, he may have overstated the true extent of the destruction. This possibility is supported by the fact that the area around Killimanjaro seems to be relatively intact during the ceremony at the end of the game.
