ECOSYSTEMS > INLAND OREGON > VALLEYS
A river valley is formed by the erosive action of water flowing over the land. These valleys are usually V-shaped with steep walls. If a river valley becomes particularly deep, it’s often referred to as a canyon or gorge.
Because river valleys are often inundated by flooding which can restore nutrients to the surrounding land, they are typically very fertile and productive regions. Throughout human history, river valleys were widely settled and farmed by human beings. In fact, some of the world's oldest cultures found their roots in these kinds of valley.
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