  The windows of low extinction in the Milky Way (MW) plane are rare but
important because they enable us to place structural constraints on the
opposite side of the Galaxy, which has hitherto been done rarely. We use the
near-infrared (near-IR) images of the VISTA Variables in the V\'ia L\'actea
(VVV) Survey to build extinction maps and to identify low extinction windows
towards the Southern Galactic plane. Here we report the discovery of VVV WIN
1713$-$3939, a very interesting window with relatively uniform and low
extinction conveniently placed very close to the Galactic plane. The new window
of roughly 30 arcmin diameter is located at Galactic coordinates (l,b)=
(347.4,-0.4) deg. We analyse the VVV near-IR colour-magnitude diagrams in this
window. The mean total near-IR extinction and reddening values measured for
this window are A_Ks=0.46 and E(J-Ks)=0.95. The red clump giants within the
window show a bimodal magnitude distribution in the Ks band, with peaks at
Ks=14.1 and 14.8 mag, corresponding to mean distances of D=11.0+/-2.4 and
14.8+/-3.6 kpc, respectively. We discuss the origin of these red clump
overdensities within the context of the MW disk structure.
