In Europe and North America , Ulan Bator was generally known as Urga ( from Ã -- rgÃ Ã ) or sometimes Kuren ( from KhÃ 1\/4 ree ) or Kulun ( from å `` å `` , the Chinese transcription of KhÃ 1\/4 ree ) before 1924 . In Europe and North America , Ulan Bator was generally known as Urga ( from Ã -- rgÃ Ã ) or sometimes Kuren ( from KhÃ 1\/4 ree ) or Kulun ( from å `` å `` , the Chinese transcription of KhÃ 1\/4 ree ) before 1924 , and Ulan Bator afterwards , after the .