"A fák mellett nagy folyókat lát János."
Translation:János sees large rivers next to the trees.
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Because in your sentence, you have the prepositional phrase "next to big rivers", but Hungarian does not talk about anything being next to rivers.
Instead, it has the postpositional phrase a fák mellett "next to the trees".
Also, the thing that János sees is big rivers: they are marked with the accusative ending -(a)t as they are the direct object. Your sentence makes him see trees instead (and misses the definite article "the").