Onsu County (Uyghur: ئونسۇ ناھىيىسى) and from Mandarin Chinese Wensu County (Chinese: 温宿县), is a county in the Xinjiang Uyghur Autonomous Region and is under the administration of the Aksu Prefecture, bordering Kyrgyzstan's Issyk-Kul Region to the northwest. It contains an area of 14,309 km2 (5,525 sq mi). Source: Wikipedia (en)