Introduction to Nantianmen: Nantianmen is located on Nanshan Mountain south of Putuo Mountain, facing Duangu Daotou. Nantianmen hangs alone into the sea, at the southernmost tip of Mount Putuo, separated from the main island by water. There is a stone bridge with a dragon-like body, so it is named Huanlong Bridge. There are huge boulders and towering rocks here. There are two stones in the middle that look like doors, so it is named Nantianmen.