10556
To the west , the north fork of the Flathead River forms the western boundary , while its middle fork is part of the southern boundary .
 location: Flathead River
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Flathead River 
Answer:
 location: Flathead River