Assertion details
1 triples in cluster

flow form the willamette valley 1
1 source sentences

Source: Shown
Subject: Shown
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  • SRC Flowing northward between the Oregon Coast Range and the Cascade Range , the river and its tributaries form the Willamette Valley , a basin that contains two - thirds of Oregon 's population , including the state capital , Salem , and the state 's largest city , Portland , which surrounds the Willamette 's mouth at the Columbia .