Hungary–Serbia border

The Tisza, Tysa or Tisa (see below) is one of the major rivers of Central and Eastern Europe. It was once called "the most Hungarian river" because it flowed entirely within the territory of the Kingdom of Hungary. Today, it crosses several national borders.

2015 border fence

The Körös-ér (Hungarian, also Kőrös-patak), Kireš or Kereš (), is a river in southern Hungary and northern Serbia, a right tributary to the Tisa river. It flows entirely within the Bačka border region: in Hungary, as a border river and in Serbia (roughly, as different authors give different data).