The Qutang Gorge is the first of the three and extends eight kilometers, from Kuimen near Baidi City in the west to Daxi Town in Wushan County in the east. It measures no more than 150 meters at its widest point and less than 100 meters at its narrowest point. A dozen or so tributaries of the Yangtze River converge and flush through the narrow cliffs of Kuimen in frightening surges. An ancient plank road, over a meter wide, at the precipice on the northern side of the Yangtze River winds from Baidi City to Qinglian River of Wushan County for 65 kilometers. It was first built in the Ming or Qing Dynasty or even earlier, and completed between 1888 and 1890.