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The recently-detected TeV gamma-ray source HESS J1923+141 coincides withSupernova Remnant (SNR) W51C and the star forming region W51B of the W51complex. We construct HI absorption spectra to SNR W51C, HII regions G49.2-0.35and G49.1-0.38 in W51B, and a nearby compact extragalactic source. Our studydetects high-velocity (HV) HI clouds (above 83 km/s) which coincide with W51B,but finds that the clouds are behind W51B. Both W51C and G49.2-0.35 have havesimilar highest-velocity absorption features at ~70 km/s. The HII regionG49.1-0.38 is behind the SNR because its HI absorption spectrum has a featureat 83 km/s. These new results argue against previous claims that the SNR hasshocked the HV HI clouds. Therefore the TeV emission from the complex shouldnot be associated with the HV HI clouds. W51C has a distance of about 4.3 kpc,smaller than the tangent point distance of 5.5 kpc in that direction, but stillin the Sagittarius spiral arm.

High velocity HI is not associated with TeV supernova remnant W51C