The Kőröshegy Viaduct on highway M7 is the longest bridge of Hungary. It runs parallel to the south shore between Zamárdi and Balatonszárszó, south of Kőröshegy in Somogy County.

It is 1872-metre-long, its highest point above ground level is at 88 metres, and it is over 23 metres wide. Its pillars have a length of 13 metres on the outside, while their width is 5.5 metres, with hollow insides. Two of the pillars also have an elevator each, indispensable for regular inspections.

The precipitation lead off the road is tapped into reservoir built for this specific purpose, whence (after cleaning) the water runs into the Séd Creek, then on to Lake Balaton.