Salar de Uyuni/ Salt flat Biome

So it doesn't have to be a salt block. Maybe it could be a mirror block with a watery surface. Imagine you're in the middle of the ocean and slowly the clouds and the water start to meet. And you found you can stand on it, because it's actually an island, located in the middle of nowhere, where it mirrors the sky. It's a flat and vast; and the water ripples when you walk across and the clouds drift gently by. Remember Chihiro from spirited away and the place where she took the train? It's so peaceful there.