Koyama Castle

Koyama Castle is a mountain fortress in Yoshida that combines multiple moats, stone walls, and earthen ramparts in its defensive layout. The site uses its elevated position to command views over the surrounding countryside.

The fortress was built in 1571 under Takeda Shingen's orders and functioned as a supply depot and military stronghold. It fell to Tokugawa Ieyasu in 1582.

The site held deep meaning for samurai warriors of the region and their role in local power structures. Visitors today can sense this military heritage through the remaining earthen platforms and fortified areas.

The best time to visit is during dry months, as walking paths on the grounds can become slippery after rain. Wear sturdy shoes to safely navigate the uneven terrain.

The round umadashi entrance displays a particular building style found only in pre-Edo period mountain fortifications. This distinctive feature remains visible on very few castles across Japan.

GPS coordinates: 35.61792,138.65653

Latest update: December 14, 2025 11:41