| Western Cascades | |
|---|---|
 The Western Cascades have been highly eroded by rivers (Breitenbush River pictured) | |
| Geography | |
  Western Cascades | |
| Country | United States |
| State | Oregon |
The Western Cascades or Old Cascades are a sub-province of the Cascade Range in the U.S. state of Oregon, between the Willamette Valley and the High Cascades.[1] The Western Cascades contain many extinct shield volcanoes, cinder cones and lava flows, and the region is highly eroded and heavily forested. Deposits of the same age as the Western Cascades are also found in southwest Washington state.
- ^ Sherrod, David. "Cascade Mountain Range in Oregon". Oregon Encyclopedia. Oregon Historical Society. Retrieved April 25, 2023.