Siófok is a town in Hungary on the southern bank of Lake Balaton in Somogy County. The town is a cultural and touristical centre, and also has several beaches and a port. Siófok is one of the richest municipalities of Hungary, due to tourism. In Siófok, the river Sió flows out of the lake. Imre Kálmán, a Hungarian composer of operettas, was born in Siófok.