  Using the Very Large Array (VLA) of the National Radio Astronomy Observatory
in the A and B configurations, we have obtained simultaneous high resolution
observations of both the 22 GHz water maser lines as well as the 22 GHz
continuum for the H II regions W49N and Sagittarius B2. The angular resolution
of both observations is ~0.1", which at the distance of W49N (11.4 kpc; Gwinn,
Moran, & Reid 1992) and Sgr B2 (8.5 kpc) corresponds to a physical size of
<1000 AU in both sources. The velocity coverage for W49N is +/- 435 km/s;
positions for 316 water maser components were obtained. The velocity coverage
for Sgr B2 is -40 to +120 km/s; positions for 68 maser components were
determined in Sgr B2 Main, 79 in Sgr B2 North, 14 in Sgr B2 Mid-North, and 17
in Sgr B2 South, for a total of 178 water maser positions in Sgr B2.
  The cross calibration scheme of Reid & Menten (1990, 1997) was used. Using
this procedure, high dynamic range continuum images were obtained with accurate
registration (rms ~0.01") of the continuum and maser positions. A detailed
comparison between H II components and maser positions for both Sgr B2 and W49N
is presented. In Sgr B2 Main, the water masers are predominantly located at the
outside edge of the high-frequency continuum, lending support to the proposal
that entrainment by stellar winds may play an important role in water maser
emission.
