Great Bear River
The long Great Bear River , which drains the Great Bear Lake westward through marshes into the Mackenzie River , forms an important transportation link during its four ice-free months . 
<triplet> Great Bear River <subj> Great Bear Lake <obj> origin of the watercourse <subj> Mackenzie River <obj> mouth of the watercourse <triplet> Great Bear Lake <subj> Great Bear River <obj> lake outflow <triplet> Mackenzie River <subj> Great Bear River <obj> tributary