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The Romans called the vassal nomadic states within the Roman Empire " Arabia Petraea " , after the city of Petra , and called unconquered deserts bordering the empire to the south and east Arabia Magna .
 location: Roman Empire; location: Arabia Petraea; location: Petra; location: Arabia Magna
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Roman Empire; location: Arabia Petraea; location: Petra; location: Arabia Magna