Individual #Silk_Road  an ancient trade route between China and the Mediterranean (4,000 miles); followed by Marco Polo in the 13th century to reach Cathay
  instance of:  trade_route
  part:  Gansu__Kansu  a province in north-central China; formerly part of the Silk Road to Turkistan and India and Persia
     part:  Lanzhou__Lanchou__Lanchow  the capital city of the Chinese province of Gansu on the Yellow River

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