72759
The area , situated on fields among the Appalachian foothills near the Potomac River , features the battlefield site and visitor center , a national military cemetery , stone arch Burnside 's Bridge , and a field hospital museum .
 location: Potomac River; location: Burnside 's Bridge
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: Potomac River, Burnside 's Bridge 
Answer:
 location: Potomac River; location: Burnside 's Bridge