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The south and south-west of the country constitute a long coast at the Gulf of Thailand , characterized by sizable mangrove marshes , peninsulas , sandy beaches and headlands and bays .
 location: Gulf of Thailand
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: Gulf of Thailand 
Answer:
 location: Gulf of Thailand