Nantianmen is on the south mountain of Putuo Mountain, and is flat with the shortgu Taotou. Nantianmen is hanging into the sea alone, separated from the island by a water, with a stone bridge, the bridge is like a dragon, named Huanlong Bridge. The boulders here stand, the dangerous rock is towering, there are two stones like a gate, so the name is. Anal moths rise horn, the middle book has the word "south heaven" three words.