  Thermal images of cold dust in the Central Molecular Zone of the Milky Way,
obtained with the far-infrared cameras on-board the Herschel satellite, reveal
a 3x10^7 solar masses ring of dense and cold clouds orbiting the Galactic
Center. Using a simple toy-model, an elliptical shape having semi-major axes of
100 and 60 parsecs is deduced. The major axis of this 100-pc ring is inclined
by about 40 degrees with respect to the plane-of-the-sky and is oriented
perpendicular to the major axes of the Galactic Bar. The 100-pc ring appears to
trace the system of stable x_2 orbits predicted for the barred Galactic
potential. Sgr A* is displaced with respect to the geometrical center of
symmetry of the ring. The ring is twisted and its morphology suggests a
flattening-ratio of 2 for the Galactic potential, which is in good agreement
with the bulge flattening ratio derived from the 2MASS data.
