African leaders have agreed to create the continent's largest free trade zone, covering 26 countries in an area from Cape Town to Cairo. The deal, signed in Egypt, is intended to ease the movement of goods across member countries which represent more than half the continent's GDP. Since the end of colonial rule, governments have been discussing ways to boost intra-African trade. The pact, known as The Tripartite Free Trade Area, will then be officially unveiled at the upcoming summit of the African Union this weekend in South Africa.