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