Sonid Left Banner (Mongolian: ; ) is a banner of north-central Inner Mongolia, China, bordering the Mongolian provinces of Dornogovi to the west and Sükhbaatar to the north. It is under the administration of Xilingol League. Sunud Mongols live here.
Sonid Left Banner is divided into 3 towns and 4 sums.
Others:
Sonid Left Banner features a cold arid climate (Köppen BWk), marked by long, cold and very dry winters, hot, somewhat humid summers, and strong winds, especially in spring. The monthly 24-hour mean temperature in January, the coldest month, is , and in July, the warmest month, , with the annual mean at . The annual precipitation is , with more than half of it falling in July and August alone.