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The Sudanian savanna is a highly diverse ecosystem that extends across the African continent from the Ethiopian Highlands in the east to the North Atlantic Ocean in the west. This tropical biome is divided into two sub-segments, which are separated by the Cameroon Highlands in west-central Africa: the West Sudanian savanna, which runs from the Atlantic to eastern Nigeria; and the East Sudanian savanna that stretches from the Cameroon Highlands to the Ethiopian Highlands. During the dry season of December to February, local temperatures are generally 68–78 degrees F (20–25 degrees C); during the tropical or wet season, the temperature is 78–86 degrees F (22–30 degrees C).