The Hexi Corridor, also known as the Gansu Corridor, is an important historical region located in the modern western Gansu province of China. It refers to a narrow stretch of traversable and relatively arable plain west of the Yellow River's Ordos Loop, flanked between the much more elevated and inhospitable terrains of the Mongolian and Tibetan Plateaus. The Hexi Corridor enabled cultural and agricultural exchange between China and Eurasia for several milennia, in both prehistory and as part of the Northern Silk Road after the Han Dynasty.