The geographic area comprised of
Oregon and Washington.
This area tends to be a high level of homogenization and interchangeability area for a few different reasons:
1) They are both very
liberal areas politically.
2) One of Washington state's largest cities (Vancouver, WA) is a suburb of Portland,
Oregon.
3) Their weather is very similar (damp winters with mild summers).
4) Although Washegon falls under the title of "West Coast", Washegon is very different in some ways to California as a whole.
5) Although Washegon falls under the umbrella title of "Pacific Northwest", it differs enough from
Idaho and Montana, that deserves its own label.