Schematic configuration of the Fomalhaut system. The outer Kuiper belt extends from 133 to 158 AU and has an eccentricity of 0.1. The orbit of Fom b has a_b = 120 AU and e_b = 0.94, that is, the peak values derived by Beust et al. (2014). Since Fom b has a low inclination relative to the outer belt and is nearly apsidally aligned with it, we represent this orbit as coplanar and apsidally aligned with the belt. We represent as well the presumed orbit of the putative Fom c, and the regions of potential origin for Fom b investigated in this paper, that is, the chaotic zone of Fom c and the region where MMRs, which may generate orbits crossing the chaotic zone of Fom c, are localized.