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The westernmost population of the species , known as the Columbian white-tailed deer , once was widespread in the mixed forests along the Willamette and Cowlitz River valleys of western Oregon and southwestern Washington , but today its numbers have been considerably reduced , and it is classified as near-threatened .
 Willamette, Cowlitz River, Oregon, Washington
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Willamette, Cowlitz River, Oregon, Washington