This essay tries to analyze and to put in perspective one self-contained, dystopian digression contained in Aline et Valcour (1795), de Sade's long, romanesque epistolary novel, namely the episode ( from the “letter XXXV” in the novel ) describing the exotic, imaginary African kingdom of Butua. While the topic requires at times to venture into the realm of utopian studies, or general Sadean studies, it must be emphasized that an exhaustive or all-encompassing analysis of the above is well beyond the scope of this paper, whose limited purpose is only a better comprehension of Sade's use of utopia to disperse a philosophical/political message, in a fashion that seems to me perfectly attuned to Enlightenment and XVIII century in general.