At the end of Zechawa gully, Changhai is the son of ancient glaciers at an altitude of 3060 meters. It has no outlet and is blocked into a lake by moraines. It is "a precious gourd that can't be filled and leaks out.) There is a "one-armed old man cypress" standing on the beach of the long sea, which has been weathered for many years, making cypress develop horizontally. There are no branches on the left, and many tadpoles on the right. It is very peculiar. It is called "flag tree" in aesthetics. From Norilong to Changhai by sightseeing bus for 20 minutes and from Changhai downhill to Wucai Lake for about 1 km. Tickets are included in the 220 yuan pass and 90 yuan sightseeing ticket, which is valid all day.