Чайно-конный путь

The oldest of the three roads, one and a half thousand years: from the Six Great Tea Mountains of Yunnan and the town of Pu'er, mules carried pressed tea through Ya'an in Sichuan, the Yangtze gates of Chongqing, and the highlands of Qinghai — to Lhasa, where Tibetans exchanged horses, salt, wool, and silver for tea, and brewed butter tea from the bricks.