The lake water of tiger sea is blue due to travertine, from light blue to royal blue and then to dark blue. The color changes evenly, which is very beautiful. The water quality is bright, and the fallen trees are clearly visible. After thousands of years, the surface of the fallen trees is covered with lime and not rotten, so they keep their original shape for a long time. The leaves of autumn are colorful, and the reflection in the sea is like the stripes on the tiger