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In the mid 19th century , the Bobangi people became major slave traders and sold their captives to the Americas using the Ubangi river to reach the coast .
 location: Bobangi; location: Americas; location: Ubangi
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: Bobangi, Americas, Ubangi 
Answer:
 location: Bobangi; location: Americas; location: Ubangi