The Kőröshegy Viaduct on highway M7 is the longets bridge of Hungary. It runs parallel to the south shore between Zamárdi and Balatonszárszó, south of Kőröshegy in Somogy County. It was opened to traffic on 8 August 2007.
It is 1872-metre-long, its highest point above ground level is at 88 metres, and it is over 23 metres wide. Its highest pillar out of the 16 is 79.70 metres high, the shortest measures 17.70 metres, and the greatest distance between two pillars is 120 metres.
The gigantic pillars are hollow on the inside. 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 Kőröshegyi-Séd patak, then on to Lake Balaton.