 In September 1911 Italy invaded Tripolitania, and the Treaty of Ouchy was signed the following year by which the Ottomans formally ceded sovereignty of the area over to Italy.The Italians organised the newly conquered region into the colonies of Italian Cyrenaica and Italian Tripolitania, and gradually began pushing the limits of the territories to the south; later, in 1934, they united the two territories as Italian Libya.France and Italy delimited the border between French Algeria and Italian Libya in 1919, which also covered the segment of the modern Libya–Niger border as far south as Tumu.