Among the various other geographic features believed of Diyu, the capital city has been thought to be named Youdu.

It is generally conceived as being similar to a typical Chinese capital city, such as Chang'an, but surrounded with and pervaded with darkness.

The general ruler of this realm is Houtu, but there are many other functionaries which have been believed to inhabit this region, and with the more important individuals being located in Youdu, as the capital city and seat of government.

Various creatures also inhabit Youdu, including Tu Bo (土伯), the warden of Youdu under the rule of Houtu, while some argue that Tu Bo itself is the primordial overlord of the underworld;[1] Diting, the steed of Di Zang, which can determine truth from falsehood.

Youdu is generally conceived of as similar to a typical historical Chinese capital city, such as Chang'an.