The Azure Dragon, also known as the Blue-Green Dragon, Qing Long or Seiryu, is one of the Four Symbols of Chinese constellations along with Vermillion Bird, White Tiger and Black Tortoise. It represents the East, spring, the color azure (green/blue) and the Wood Element.
In Japan, it is one of the four guardian spirits of cities and protects Kyoto. The Dragon is frequently referred to in the media, feng shui, other cultures, and in various venues as the Green Dragon and the Avalon Dragon. His cardinal direction's epithet is "Bluegreen Dragon of the East".
This dragon is also known as Seiryu in Japanese, Cheongnyong in Korean and Thanh Long in Vietnamese.
In some official English version this demon is incorrectly translated as Long due to confusion between Four Symbols (Si Xiang) and four benevolent animals (Si Ling or Ssu-Ling) of China. In the original Japanese version, Seiryu or Qing Long represents one of the Four Symbols and Ryu or Long belongs to four benevolent animals which are fundamentally different.