  Methanol masers are associated with young high-mass stars and are an
important tool for investigating the process of massive star formation. The
recently discovered methanol maser ring in G23.657-00.127 provides an excellent
``laboratory'' for a detailed study of the nature and physical origin of
methanol maser emission, as well as parallax and proper motion measurements.
Multi-epoch observations of the 12.2 GHz methanol maser line from the ring were
conducted using the Very Long Baseline Array. Interferometric observations with
milliarcsecond resolution enabled us to track single maser spots in great
detail over a period of 2 years. We have determined the trigonometric parallax
of G23.657-00.127 to be 0.313+/-0.039 mas, giving a distance of
3.19{+0.46}{-0.35} kpc. The proper motion of the source indicates that it is
moving with the same circular velocity as the LSR, but it shows a large
peculiar motion of about 35 km/s toward the Galactic center.
