Oryahovo
It is located in a hilly country on the right bank of the Danube , just east of the mouth of the river Ogosta , a few more kilometres downstream from where the Jiu flows into the Danube on Romanian territory . 
<triplet> Danube <subj> Ogosta <obj> tributary <subj> Jiu <obj> tributary <subj> Romania <obj> country <triplet> Ogosta <subj> Danube <obj> mouth of the watercourse <triplet> Jiu <subj> Danube <obj> mouth of the watercourse <subj> Romania <obj> country