21841
The ranges forms a high barrier separating the headwaters of the Arkansas River near Leadville from South Park and the headwaters of the South Platte River near Fairplay .
 Arkansas River, Leadville, South Park, South Platte River, Fairplay
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Arkansas River, Leadville, South Park, South Platte River, Fairplay