Japanese dragons (日本の竜/龍, Nihon no ryū) are diverse legendary creatures in Japanese mythology and folklore. Japanese dragon myths amalgamate native legends with imported stories about dragons from China, Korea and the Indian subcontinent. The style and appearance of the dragon was heavily influenced by the Chinese dragon, especially the three-clawed long (龍) dragons which were introduced in Japan from China in ancient times. Like these other East Asian dragons, most Japanese ones are water deities or kami associated with rainfall and bodies of water, and are typically depicted as large, wingless, serpentine creatures with clawed feet.
The c. 680 AD Kojiki and the c. 720 AD Nihongi mytho-histories have the first Japanese textual references to dragons. "In the oldest annals the dragons are mentioned in various ways," explains de Visser, "but mostly as water-gods, serpent- or dragon-shaped." The Kojiki and Nihongi mention several ancient dragons:
Yamata no Orochi 八岐大蛇 "8-branched giant snake" was an 8-headed and 8-tailed dragon slain by the god of wind and sea Susanoo, who discovered the Kusanagi-no-Tsurugi (legendary sword of the Imperial Regalia of Japan) in one of its tails.
Watatsumi 海神 "sea god" or Ryūjin 龍神 "dragon god" was the ruler of seas and oceans, and described as a dragon capable of changing into human form. He lived in the undersea Ryūgū-jō 龍宮城 "dragon palace castle", where he kept the magical tide jewels.
Toyotama-hime 豊玉姫 "Luminous Pearl Princess" was Ryūjin's daughter. She purportedly was an ancestress of Emperor Jimmu, Japan's legendary first emperor.
Wani 鰐 was a sea monster that is translated as both "shark" and "crocodile". Kuma-wani 熊鰐 "bear (i.e., giant or strong) shark/crocodile" are mentioned in two ancient legends. One says the sea god Kotoshiro-nushi-no-kami transformed into an "8-fathom kuma-wani" and fathered Toyotama-hime, the other says a kuma-wani piloted the ships of Emperor Chūai and his Empress Jingū.
Mizuchi 蛟 or 虯 was a river dragon and water deity.