evidence: Zambezi (shared with Zambia [s]), Angola, Botswana, Zimbabwe, and Mozambique [m]) - 2,740 km; Orange river mouth (shared with Lesotho [s], and South Africa) - 2,092 km; Okavango (shared with Angola [s], and Botswana [m]) - 1,600 km note – [s] after country name indicates river source; [m] after country name indicates river mouth [...] Namibia-Botswana-Zambia-Zimbabwe: Namibia has supported, and in 2004 Zimbabwe dropped objections to, plans between Botswana and Zambia to build a bridge over the Zambezi River, thereby de facto recognizing a short, but not clearly delimited, Botswana-Zambia boundary in the river; the Kazungula Bridge opened to traffic in May 2021 Namibia-South Africa: the governments of South Africa and Namibia have not signed or ratified the text of the 1994 Surveyor's General agreement placing the boundary in the middle of the Orange River; Namibia claims a median line boundary, while South Africa supports the northern bank of the river