茶馬古道 [ㄔㄚˊ ㄇㄚˇ ㄍㄨˇ ㄉㄠˋ; cha2 ma3 gu3 dao4] old tea-horse road or southern Silk Road, dating back to 6th century, from Tibet and Sichuan through Yunnan and Southeast Asia, reaching to Bhutan, Sikkim, India and beyond ◄ ►