Coos River
Formed by the confluence of its major tributaries , the South Fork Coos River and the Millicoma River , it drains an important timber-producing region of the Southern Oregon Coast Range . 
<triplet> Coos River <subj> South Fork Coos River <obj> tributary <subj> Millicoma River <obj> tributary <triplet> Millicoma River <subj> Coos River <obj> mouth of the watercourse