Tafkin Kariba shine babban tafki da mutum yayi a duniya da kuma matattarar ruwa mai girma. Tana da nisan kilomita 1,300 (mi 810) daga Tekun Indiya, tare da iyaka tsakanin Zambiya da Zimbabwe. Tafkin Kariba ya cika tsakanin shekarun 1958 da 1963 biyo bayan kammala Dam din Kariba a ƙarshen arewa maso gabas, ya mamaye Kogin Kariba akan Kogin Zambezi. Garin Kariba na Zimbabwe an gina shi ne don masu aikin gini a madatsar ruwan tafkin, yayin da wasu matsugunai kamar ƙauyen Binga da Mlibizi a Zimbabwe da Siavonga da Sinazongwe a Zambiya suka girma don zama mutanen da ruwan sama ya raba da muhallansu. Tafkin Kariba ya wuce kilomita 223 (mil 139) tsawo kuma ya kai kilomita 40 (faɗi 25) a faɗi. Ya mamaye yanki na murabba'in kilomita 5,580 (murabba'in mil 2,150) kuma damar ajiyar sa ya kai kilomita mai girman kilomita 185 (kimanin kilomita 44). Matsakaicin zurfin tafkin ya kai mita 29 (ƙafa 95); mafi zurfin mita 97 ne (ƙafa 318). Ita ce matattarar ruwa mafi girma da aka yi da mutum a duniya, ta hanyar girma, ninki huɗu kamar na Dam din Three Gorges.