It's about 30000 meters. Mount Everest, the highest peak in the world, is only 8844 meters. The elevation of the first-floor civil building in China is about 2.8 meters, even if it is 3 meters, it is also a 30,000-story high-rise building. Almost unimaginable.
Therefore, this is a very exaggerated statement.
Cliffs are generally not high, but they are deep.
I hope I can help you.