As of 2021, the Danyang–Kunshan Grand Bridge is considered the longest bridge in the world. It is a 164.8-km-long viaduct bridge in China, consisting of 2000 spans of ~80 m long each. Like every other bridge, it is constructed following Earth’s curvature.
A hoax in flat Earth communities claims the Danyang–Kunshan Grand Bridge somehow “proves” flat Earth. In reality, it is just a claim asserted without evidence and then spread as a hoax.
The bridge is a viaduct with many short spans, and therefore, accounting for Earth’s curve is less critical than in the case of longer-spanning bridges. Nevertheless, it is still built to follow Earth’s curvature.
As a side note, the picture of the bridge that spread in flat Earth communities is not the Danyang–Kunshan Grand Bridge but either the Hangzhou Bay Bridge or the Jiaozhou Bay Bridge. Both are unrelated to the Danyang–Kunshan Grand Bridge.
These flat-Earthers only have pictures of the wrong bridge, taken at an unsuitable angle to observe the curvature. Other than that, they do not have anything to support their assertion.
- Danyang–Kunshan Grand Bridge – Wikipedia