Okuyama

Okuyama (素山) is a city located in far southern Heisai Prefecture. As of 2022, it has a population of around 16,000. 
Okuyama is a well-known border town which now sits on the border between Heisai and Saka, but originally marked the end of the Senyama territory. The Okuyama Barrier, a large and complex fortification, was built and maintained by the Senyama clan in the 1300s to defend against Torima invaders. During the Kuyūmi War, fought between the Senyama and Torima clans, the town of Okuyama was instrumental in providing defence for the Senyama forces. During its history, Okuyama has been seiged a total of six times. 
== Geography ==
Okuyama is situated between the Meisu River to the west and the Yūmi Mountains to the east, on the border with Saka Prefecture. The region was once known for sericulture, but transitioned to fruit cultivation during the 18th century. During the 1990s Okuyama absorbed a total of five smaller towns which neighboured it. 
== Economy ==
The economy of Okuyama is primarily agricultural, with an emphasis on rice and fruits. The area is noted for its peaches and persimmons. Okuyama is also a strong industrial centre. 
== Local attractions ==
- Ruins of the Okuyama Barrier
- Mount Okuyama
- Okuyama Temple
- Ruins of Hanaga Castle
- Takahashi Castle
- Okuyama Museum
- Honbun Park