O Jouganesan Observatory (ruins of Osaku castle), is located in the Fujioka neighborhood in Toyota city. From the observation platform, you can see the entire Fujioka region and Mount Sanage. The viewpoint has an altitude of about 220 meters.
The walk to the observatory it starts with a steep staircase, then just follow the trail on your left for about 30 minutes (600 meters), on the trail there is a rest hut and bench to take a break.
There is also a small Waterfall. After climbing the ladder there is a sign indicating that the trail on the right leads to the waterfall (the sign is written in Japanese), but there is no mistake, just follow the trail on the right for about 5 minutes.
Aichi-ken Toyota-shi Mitsukurichō Uenotaira