Middle Fork Koyukuk River
The Middle Fork Koyukuk River is a tributary of the Koyukuk River in the U . S . state of Alaska . 
<triplet> Middle Fork Koyukuk River <subj> Koyukuk River <obj> mouth of the watercourse <subj> Alaska <obj> located in the administrative territorial entity <triplet> Koyukuk River <subj> Middle Fork Koyukuk River <obj> tributary