New book History and geography Were there six trees in 『 Roppongi 』? A Mystery of Tokyo Area Morning new book

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History / Geography
In fact, in Roppongi, there is a pine tree that is the origin of the name of the place? Is the origin of the name of the place that has been handed down from generation to generation true? Is there a blue mountain in 「 Aoyama? Is there a four valley in 」 「 Yotsuya? For example, I actually went and checked the information about the latest 」 in 「 and the "deepest" place name.