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UCHII G25.4NW is a bright IR source in the inner Galaxy region.  New HI images from the VLA Galactic Plane Survey (VGPS) show clear absorptionfeatures associated with the UCHII region up to 95 km s$^{-1}$, and there isnot any other absorptions up to the tangential velocity.  It reveals that G25.4NW is at a near-side distance of 5.7 kpc, and it islocated in the inner Galactic molecular ring region.  Using the new distance, the bolometric luminosity of G25.4NW is estimated as$10^{5.6} L_{\odot}$, which corresponds to an O6 star.  It contains 460 $M_{\odot}$ of ionized gas. High-resolution $^{13}$CO imagefrom the Galactic Ring Survey (GRS) reveals that G25.4NW is part of a moreextended star-formation complex with about $10^{4} M_{\odot}$ molecular gas.

Properties of the UCHII region G25.4NW and its associated molecular cloud