What's the name of the monster of Heishui River in Journey to the West?

The monster of Heishui River in Journey to the West is called Keelung.

Ji Long is the ninth son of the sister of the West Sea Dragon King, and Ji Long's father was the Jinghe Dragon King who was beheaded in Kevin·Z's dream because of the wrong rainfall. The sister of the West Sea Dragon King lost her husband and she had nowhere to live. She left the dragon in the West Sea Dragon Palace. Wang Long of Xihai helps his sister raise dragons. After the death of his sister, Wang Long of Xihai sent the dragon to Heishui River to cultivate his mind. Unexpectedly, he behaved strangely.

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The appearance of Xiaolong can basically be summarized in two words: one is "ugly" and the other is "horrible".

"Jilong" is a Chinese alligator, commonly known as "Pig Polong"; "One or two feet long, grayish black, with scales like armor on the back and tail." In ancient times, it was known that the skin of Chinese alligator was used to make drums. There are many stories about the appearance of dragons in literary works. For example, there is a story about Wen in "The Carving of Galvatron". It is said that this unlucky man found a huge turtle shell on a desert island and sold it to a Persian businessman.