  Compelling evidence for the existence of astrophysical neutrinos has been
reported by the IceCube collaboration. Some features of the energy and
declination distributions of IceCube events hint at a North/South asymmetry of
the neutrino flux. This could be due to the presence of the bulk of our Galaxy
in the Southern hemisphere. The ANTARES neutrino telescope, located in the
Mediterranean Sea, has been taking data since 2007. It offers the best
sensitivity to muon neutrinos produced by galactic cosmic ray interactions in
this region of the sky. In this letter a search for an extended neutrino flux
from the Galactic Ridge region is presented. Different models of neutrino
production by cosmic ray propagation are tested. No excess of events is
observed and upper limits for different neutrino flux spectral indices are set.
This constrains the number of IceCube events possibly originating from the
Galactic Ridge. A simple power-law extrapolation of the Fermi-LAT flux to
associated IceCube High Energy Starting Events is excluded at 90% confidence
level.
