evidence: Zambia has a long land border on the west with Angola but is divided from its neighbours to the south by the Zambezi River. To the southwest is the thin projection of Namibian territory known as the Caprivi Strip, at the eastern end of which Zambia and three of its neighbours (Namibia, Botswana, and Zimbabwe) appear to meet at a point—a "quadripoint"—although the precise nature of the meeting is contested. Man-made Lake Kariba now forms part of the river border with Zimbabwe. Zambia’s other neighbours include Mozambique to the southeast, Malawi to the east, and Tanzania to the northeast. The long border with the Democratic Republic of the Congo starts at Lake Tanganyika, crosses to Lake Mweru, and follows the Luapula River to the Pedicle, a wedge of Congolese territory that cuts deep into Zambia to give the country its distinctive butterfly shape. Westward from the Pedicle the frontier follows the Zambezi-Congo watershed to the Angolan border.