From Badong County in the west to the Nanjin Pass in Yichang in the east, about 66 km long, Xiling Gorge is the longest of the Three Gorges and is entirely within Hubei Province. This gorge is full of shoals and rapid currents. The most dangerous shoals are Xietan, Qingtan and Kongling, collectively known as the Three Shoals of Xiling. Among all the dangerous shoals, Qingtan Shoal and Kongling Shoal are the most famous.