is transported in tugs via the rivers? )
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AntonijaHi!I would use "on".
I'm looking for a suitable preposition. Thank you
Oil is transported through rivers in river tankers (tugs).
LikegusleeOil is not transported through or on rivers because that would imply that oil can travel through or on rivers.
What you are trying to express is the route by which oil is transported. Therefore, you should use “