Kazungula is a small border town in Zambia, lying on the north bank of the Zambezi River about west of Livingstone on the M10 Road. At Kazungula, the territories of four countries (Zambia, Botswana, Zimbabwe, and Namibia) come close to meeting at a quadripoint. It has now been agreed that the international boundaries contain two tripoints joined by a short line roughly long forming a boundary between Zambia and Botswana, now crossed by the Kazungula Bridge. The ever-shifting river channels and the lack of any known agreements addressing the issue before 2000 led to some uncertainty in the past as to whether or not a quadripoint legally existed. Thus, Botswana and Zambia share a border of about at the confluence of the Chobe River and the Zambezi River, between Impalila Island, the extreme tip of Namibia's Caprivi Strip and Zimbabwe. The Chobe River, which divides Namibia and Botswana, enters the Zambezi near Kazungula. Kazungula is an important trade destination to both Zambia and Botswana. Kazungula Bridge is a road and rail bridge over the Zambezi river between the countries of Zambia and Botswana at Kazungula. The bridge was opened for traffic on 10 May 2021, replacing the Kazungula Ferry. The bridge crossed the wide Zambezi river to the identically-named village of Kazungula in Botswana, east of the town of Kasane; it was one of the largest ferries in the region with a capacity of . The 923-metre-long (3,028 ft) by 18.5-metre-wide (61 ft) bridge has a longest span of 129 metres (423 ft) and links the town of Kazungula in Zambia with Botswana and is curved to avoid the nearby borders of Zimbabwe and Namibia. The bridge has a single-line railway track between two traffic lanes and pavements for pedestrians. During the building of the Kazungula Bridge, Zimbabwe disputed that there was a direct border between Botswana and Zambia. Zimbabwe claimed that Botswana and Zambia actually do not have a direct border, but rather the border was actually between Zimbabwe and Namibia.