8064
The fort had cliffs to the east , a ravine to the south , and earthworks comprising a double rampart and ditch on the other two sides .
 None
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:  
Answer:
 None