Haixiandu, as its name implies, is not high in altitude, but it has a wide range. It really takes about three days to climb the whole mountain. We used to catch up that day. We climbed the mountain from 9:00 a.m. to 5:00 p.m. and then climbed a small range over 10 kilometers. There are still many places that we haven't visited. Listening to the peers, it takes a long time to climb the whole mountain. It takes more than four hours for the first day. It's very narrow, dark and deep. In order to save time, we didn't go there. It's a good place to watch the sea trestle road and take pictures.