  We apply the Landau equations, whose solutions parameterize the locus of
possible branch points, to the one- and two-loop Feynman integrals relevant to
MHV amplitudes in planar $\mathcal{N}=4$ super-Yang-Mills theory. We then
identify which of the Landau singularities appear in the symbols of the
amplitudes, and which do not. We observe that all of the symbol entries in the
two-loop MHV amplitudes are already present as Landau singularities of one-loop
pentagon integrals.
