That confused me too Michał as it's completely inaccurate :-). In addition to St. Sabbas' in Alexandria there's St. George's in Old Cairo, two monasteries in Tanzania under the Metropolis of Mwanza, and another monastery in Kenya under the Coptic Orthodox Church. I think there's also a monastery or skete in South Africa, but it may have closed since its founders death (?).
And then of course there are a host of monasteries under the Coptic, Ethiopian, and Eritrean Orthodox Churches in Egypt and the Horn of Africa :-).