  The distribution of cosmic rays in the Galaxy at energies above few TeVs is
still uncertain and this affects the expectations for the diffuse gamma flux
produced by hadronic interactions of cosmic rays with the interstellar gas. We
show that the TeV gamma-ray sky can provide interesting constraints. Namely, we
compare the flux from the galactic plane measured by Argo-YBJ, HESS, HAWC and
Milagro with the expected flux due to diffuse emission and point-like and
extended sources observed by HESS showing that experimental data can already
discriminate among different hyphoteses for cosmic ray distribution. The
constraints can be strengthened if the contribution of sources not resolved by
HESS is taken into account.
