"Sok színes kacsa úszik a széles, mély folyón."
Translation:Many colorful ducks are swimming in the wide, deep river.
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Definitely in the river even though they are floating. „On the river“ suggests something geographically associated with the river, since this is an idiomatic use, as in place names such as Stoke-on-Trent or Stratford-upon-Avon. So in my humble opinion ducks would be common on but swim in the river.