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The border between the Black Sea and the Caspian is usually placed along the crest of the Caucasus Mountains , although it is sometimes placed further north .
 location: Black Sea; location: Caspian; location: Caucasus 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: Black Sea, Caspian, Caucasus Mountains 
Answer:
 location: Black Sea; location: Caspian; location: Caucasus Mountains