The lake is currently divided into two areas: Noong I Lake and Noong II Lake. The water source of this lake flows from the underground water inside the rock caves. In addition, there are 3 underground water caves flowing in from Lo River. So if you come to Noong Lake - Ha Giang in the rainy season, you will see schools of fish swimming freely from the river into the lake, creating an extremely diverse underwater ecosystem. This is also a unique feature that contributes to beautifying the magical "fairyland" space here.