35837
Close to the seacoast , rivers often provided adequate waterways , but the Appalachian Mountains , inland , running over long as a barrier range with just five places where mule trains or wagon roads could be routed , presented a great challenge .
 location: Appalachian Mountains
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: Appalachian Mountains 
Answer:
 location: Appalachian Mountains