How merge two parts of the same river

The river “Rifred” in Calonge (Catalonia) is cut into two parts. There is no reason for it. Vissir and Pere Caner draw it as one. I cannot find how to paste those two elements together. The general talk old help (from 2017) doesn’t help me, i tried.

you mean those two?

The reason why you not be able to merge them is this
image
you have to split the right segment - I guess this does not belong to your river

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Thank you a lot, it was very helpful to solve my problem. Moltes mercès, m’heu ajudat molt per a resoldre el problema.

Frank Flamenc