Angolan diamonds earned their reputation from their alluvial sources. The rich alluvial deposits of the Cuango, Luachimo, Chicapa, Chiumbe, Luana and Luembe rivers (running S – N, flowing from the center of Angola into the Kasai River in Congo) contain a very high proportion of gem diamonds. These rivers also cross or border many of the country’s kimberlites, e.g. the Chicapa River that crosses the Camatchia, Camafuca-Camazambo, Damba, Camuanzanza and Sangamina kimberlites, adding to their importance.