Here is "forgotten Land IV", probably the last.
It's the closest to my initial idea.
As is often the case, there are imperfections with the waterfalls.
Trigger words: Forgotten land, fantasy scenery, cliff, water, waterfall, (floating), (ruins)
Useful prompts: (floating island), (mountainous horizon)
Negative prompts: text, trademark, copyright, signature, logo
Strength: 0.7 -> 1 (0.8 is enough)