3735
The area 's topography is characterized by the broad alluvial plain of the Arkansas River valley and the moderately rolling slopes that rise to the higher lands on either side .
 location: Arkansas 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: Arkansas River 
Answer:
 location: Arkansas River