Lanzhou is a long and narrow valley stretching east-west, sandwiched between the north and south mountains, and the Yellow River crosses the city. Along the south bank of the Yellow River, a riverside road opened for dozens of kilometers from east to west. Because of the wide and straight road, the flower bed nursery on both sides is scattered and known as the green promenade. It is a city that never sleeps, and it is brightly lit at night, and many artists sing here.