The Supreme Azure, one of the three Azure Realms in the World Above. The others are Yi Qing and Shang Qing. The Azure Realms are thought to be among the oldest locations in the World Above, seemingly immune to the constant change that marks the rest of the spiritual realms. They are quite difficult to get to, as only the most powerful spirits can find the paths that lead to them.
Tai Qing is said to be the location of the Golden Palace of the Immortals.