大宛

Located in today's Ferghana Valley (Uzbekistan / Tajikistan / Kyrgyzstan), Dayuan is most likely the same Hellenistic-influenced Greek-Bactrian state that lent its name to the Yuezhi 月氏 contacts. Han Wudi's two military expeditions to Dayuan (104–101 BCE), launched to seize the famous 'blood-sweating' Ferghana horses (汗血宝马), are recorded by Sima Qian in the 史记·大宛列传 — a foundational text for the early Silk Road.

宛 here is read yuān (1st tone), not the more common wǎn (3rd tone, as in 婉转 / 宛如). Always 'Dà-yuān'.