Trotuș
It emerges from the Ciuc Mountains in the Eastern Carpathians and joins the Siret after passing through Comănești and Onești in Bacău County . 
<triplet> Comănești <subj> Bacău County <obj> located in the administrative territorial entity <triplet> Onești <subj> Bacău County <obj> located in the administrative territorial entity <triplet> Bacău County <subj> Comănești <obj> contains administrative territorial entity <subj> Onești <obj> contains administrative territorial entity