sentences:  The vast majority of this area is on continental Africa, while the only significant territory off the mainland is the island of Madagascar (the world's fourth-largest island), and the Sinai peninsula accounting for slightly less than 2% of the total.The total population of the African Union is estimated at more than 1.25 billion, with a growth rate of more than 2.5% p.a.The primary working languages of the African Union are English and French.