The Balla Hill Tunnel is located between chainages 325+85 hm and 329+60 hm of the MÁV railway line between Zalaegerszeg and the state border as a part of the railway link between Hungary and Slovenia. The tunnel crosses sedimentary strata of the rivers Rába and Kerka. Clay layers of medium hard consistency can be found at the tunnel roof and in the covering layers above, while gravel- and sand-containing layers are to be encountered in the core and bottom of the tunnel. Of the groundwaters, pressure water is absent along the tunnel, however, confined waters are present.

The lining of the tunnel consists of two shells corresponding to the geotechnical conditions. The external tunnel lining is made with shotcreting technology by stages, as the tunnel driving advances. The internal lining is made of reinforced concrete units, which are assembled behind the formwork moved on a carriage. Waterproofing is installed between the two linings.

Recesses are established in the side wall of the tunnel with a spacing of 25 m at the left and right, alternating. The portal of the tunnel is shaped as an inclined ellipsis which blends into the topography of the landscape.