This is the Taushubetsu River Bridge in Kamishihoro Town, Hokkaido. It has a unique presence reminiscent of an ancient ruin.
In the past, it was accessible freely, but now the gates are closed.
You need to either reserve a key from the roadside station or join a tour from places like the Higashitaisetsu Nature Guide Centre to visit.
You can park your car before the forest road gate and walk or bike there, but it's a rough 4-kilometer gravel road.
Also, it's out of mobile service range, so there’s no way to contact anyone in case of trouble.
Additionally, this area is a habitat for brown bears, so all actions are at your own risk.
Every year, the bridge sinks into the lake after autumn and freezes in mid-winter, leading to weathering and collapse in various places.
Some parts also crumbled during the spring earthquake.
It won't be long before it can no longer maintain its complete arch.