Xiamen

Thank you very much Michael. Not only did you answer my question, but your use of the term 東京山手線内 led me to JR's 旅客営業規則 (Passenger Sales Regulations). I now also understand why the 山 designation matters. Very glad to have found this forum and hope I can contribute in the future. Xia

Hello, I've always been curious about the "山区" often seen in the upper right of station signs. I understand the the 区 means the station is within the 23 special wards of Tokyo. I've heard the 山 means it's on the Yamanote line, but am a little skeptical. I believe the color of the box in the middle of the green stripe defines the line. Also, the attached image has the "山区" but is for the Chuo line. Thank you for any assistance.