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They are thought to have used a simple form of watercraft to cross the narrow span of water between the Red Sea and the Gulf of Aden .
 location: Red Sea; location: Gulf of Aden
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: Red Sea, Gulf of Aden 
Answer:
 location: Red Sea; location: Gulf of Aden