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We have investigated the stellar and interstellar content of the distant starformation region IRAS 17591-2228 (WISE HII region GAL 007.47+0.06). It isassociated to a water maser, whose parallax distance is d=20.4^{+2.8} {-2.2}kpc, supported by independent measurements of proper motion and radialvelocity. It is projected in the same direction as an extremely red (J-Ks ~ 6mag) group of stars, and a shell of mid-infrared emission. We qualify the groupof stars as a cluster candidate, VVV CL177. Its radius spans between 0.45' and1' and contains at least two young stellar objects with an extreme extinctionnear Av ~ 40 mag. Yet more analysis will be required to determine is it is areal single cluster associated with the water maser. The 13CO emissions at theradial velocity of the maser corresponds to the mid-infrared emission.

Assessing the stellar population and the environment of an HII region on the far side of the Galaxy