I'm seeing a few references to 海半仙 in articles I'm going over.
For instance: there is this note on Douban
There are references there to the Classic of Mountains and Seas, so I'm assuming there would be some sort of reference to this in English, but I'm not really finding anything.
The only thing I've remotely found is this sandbox on Wikipedia.
Tongshanshao a kind of wine, also called shocks or sorghum wine.In the remote hometown of xi shi, there is a town called tongshan town, which is rich in sorghum. Sorghum rice has no longer been used as food for many years, so the common people there use it to make soju, and carry forward it into a characteristic. As a result, this kind of wine has a common name, called "tongshan shao".
Other than this I'm not really able to find anything about 同山镇 -or- 海半仙 -or- 翠屏 in English.