Introduction to Tongling Lane Valley: The road to Longtan Grand Canyon is well built, so there is no need to climb mountains. There is a section of the canyon with a relatively straight bottom and upright cliffs on both sides, more than a hundred meters long and ten meters wide, and the road is also very smooth. Walking in the canyon is like walking through a street and an alley, so this section of the canyon is called an "alley." valley".