The Lake of Four Waters was where four rivers met. Thus, its surface was always covered with roaring waves. However, underneath the surface of the water was a complete calmness. Apart from some swift undercurrents that flowed in specific routes, there was beautiful scenery everywhere, and it actually looked like an underwater paradise.
The catfish-flood-dragon's cave was located in a deep trench slightly to the west from the center of the lake. The depth of the water here was over thirty miles, and the lake bed was paved with strange stones, white like jade stones and shaped like coral. These strange rocks could be found everywhere within a region one hundred miles wide. Amidst these strange rocks, there was a deep trench that stretched tens of miles long, measured nearly one mile from edge to edge, and plunged one hundred miles straight down. The catfish-flood-dragon's cave was built in one of the underwater cave found in this deep trench.