About a 5-10-minute drive from Yugo Onsen, the Oyama Observatory appears at the end of a mountain road that climbs sharply in elevation. The town of Yugo and the Yoshino River (a tributary of the Yoshii River) spread out below, and on a clear day, you can see Mount Nagi, Mount Ushiro, and the mountain ranges of the Tsuyama Basin. Whether you're looking to capture the entire hot spring town with a wide-angle lens or snap a photo with your smartphone, the clear view is a delight.

The observation deck changes with the seasons. From mid-June to July, the Hydrangea Road, with its 2.5km of blooming flowers, is a popular spot for cherry blossom viewing while driving. From late autumn to early winter, a sea of ​​clouds can appear, creating a mystical sight as the town lights of Yugo and the morning glow overlap. After sunset, the observation deck is also known as a hidden gem for night views and stargazing, popular with families for evening drives and couples for a romantic getaway.

If you're staying at Yugo Onsen, watching the sunrise and sunset is a truly moving experience. It's a recommended spot for couples on a date.

The observation deck has a cute tree trunk design, and there are toilets on the first floor.

There is free parking near the summit, and the observation deck is about a 2-minute walk along a paved path.