The sign in the image uses German text ("Lebensgefahr"). The industrial building with tall chimneys and the surrounding lush, temperate forest are characteristic of Central Europe. The bright green water suggests a specific canal or industrial waterway setting. I am fairly confident this is in Germany.

Country: Germany
City/Area: Near a power plant or industrial site, possibly in the Ruhr area or near Berlin.
Confidence: 60%

then: forward

The 360-degree view shows a cyclist on a dirt path next to a canal with distinctively bright green, algae-filled water. The industrial building in the background remains a key feature, and the vegetation is typical of a deciduous forest in Central Europe. The overall scene, including the cycling infrastructure, points strongly toward a recreational area near an industrial zone in Germany. I suspect this is near the Emscher river or a similar industrial canal system in the Ruhr region.

Country: Germany
City/Area: Ruhr region, near Gelsenkirchen or Essen.
Confidence: 75%

then: guess