Ryou'un (凌雲山), lit. "skyscraping mountain," is the name of the mountain that houses the palaces of the emperor/empress and province lords in each kingdom. The Royal En describes the Sea of Clouds in chapter 57 of Shadow of the Moon.
The education system is briefly explained in chapter 50 of Shadow of the Moon:

Shire-level preparatory schools are called jogaku and prefectural academies are called shougaku. Students aiming for a district academy (joushou) can do their preparatory work at a prefectural academy, or can attend a prefectural polytechnic college (shoujo).

A successful student would proceed from there to the provincial colleges and finally to the Imperial University.

「木」 is a tree, so 「森」 is a forest. 「虫」 is an insect, so 「蟲」 is a swarm. Another species of mushi shows up in Mushi-shi (蟲師), the manga/anime/feature film created by Yuki Urushibara.

Labels: 12 kingdoms, tonan