Chinese culture
Chinese dragons are legendary creatures in Chinese mythology, Chinese folklore, and East Asian culture at large. Chinese dragons have many animal-like forms such as turtles and fish, but are most commonly depicted as snake-like with four legs. They traditionally symbolize potent and auspicious powers, particularly control over water, rainfall, typhoons, and floods. The dragon is also a symbol of power, strength, and good luck for people who are worthy of it in East Asian culture. During the days of Imperial China, the Emperor of China usually used the dragon as a symbol of his imperial power and strength. They are also the symbol and representative for the Son of Heaven, the Mandate of Heaven, the Celestial Empire and the Chinese Tributary System during the history of China.
Japanese dragon
When Buddhist monks from other parts of Asia brought their faith to Japan they transmitted dragon and snake legends from Buddhist and Hindu mythology. The most notable examples are the "nāga" ナーガ or 龍 "Nāga; rain deity; protector of Buddhism" and the "nāgarāja" ナーガラージャ or 龍王 ”Nāgaraja; snake king; dragon king". de Visser (1913:179) notes that many Japanese nāga legends have Chinese features. "This is quite clear, for it was via China that all the Indian tales came to Japan. Moreover, many originally Japanese dragons, to which Chinese legends were applied, were afterwards identified with nāga, so that a blending of ideas was the result." For instance, the undersea palace where nāga kings supposedly live is called Japanese ryūgū 龍宮 "dragon palace" from Chinese "longgong" 龍宮. Compare ryūgū-jō 龍宮城 "dragon palace castle", which was the sea-god Ryūjin's undersea residence. Japanese legends about the sea-god's tide jewels, which controlled the ebb and flow of tides, have parallels in Indian legends about the nāga's "nyoi-ju" 如意珠 "cintamani; wish-fulfilling jewels".