Dayuan (or Tayuan; Chinese: 大宛; pinyin: Dàyuān; lit. 'Great Ionians'; Middle Chinese dâiC-jwɐn < LHC: dɑh-ʔyɑn) is the Chinese exonym for a country that existed in Ferghana valley in Central Asia, described in the Chinese historical works of Records of the Grand Historian and the Book of Han. It is mentioned in the accounts of the Chinese explorer Zhang Qian in 130 BCE and the numerous embassies that followed him into Central Asia. The country of Dayuan is generally accepted as relating to the Ferghana Valley, controlled by the Hellenistic polis Alexandria Eschate (modern Khujand, Tajikistan), which can probably be understood as "Greco-Fergana city-state" in English language.