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Beside the Pei River, there is a high mountain with steep cliffs and tall pines, which is called Yulong Mountain. People call it Yulong Mountain not because it is tall and majestic, but because there is a hole in its belly, and there is a pool in the hole, which is extremely deep and leads directly to the Dragon Palace of the East China Sea. The children of the Dragon King of the East China Sea often come to the pool to play and scatter countless dragon lice, which turn into a rare small fish in the world. No matter what fish is called, this mountain is named after fish, so it is called Yulong Mountain. This is of course folklore. However, there is a kind of fish in the pond, which is very rare.