In the golden autumn of September, the northern Xinjiang Tianchi (six), "Tianchi", located in the Aershan National Forest Park, also known as "Aershan Tianchi", is the natural cooling of the lava of the volcano after the eruption, shrinking and sinking, forming a concave crater, and the later groundwater recharge or precipitation accumulates water at the crater site. A crater lake. Tianchi was formed about 10-300,000 years ago. It is one of the famous Tianchis in the country and has four magical things: First, the drought is not long, the rain is not overflowing; second, the pool water is closed, that is, there is no inlet, no outlet, but the pool water is clean and clear; Third, the surrounding sister lakes are full of fish, but there is no fish in Tianchi; fourth, the depth of the pool is unfathomable..., is the first choice for visiting Aershan.