alkali flat
A barren, white-crusted expanse of soil in an arid basin where evaporation has concentrated salts — sodium carbonate, sodium sulfate, sodium chloride — at the surface, creating a sterile, often blinding-white crust. Nothing grows on a true alkali flat. The soil is poisoned by its own chemistry, the water table too saline for roots, the surface too caustic for germination. Alkali flats shimmer in heat, crack in geometric patterns, and represent one of the harshest conditions soil can reach.
Etymology
From Arabic al-qily, the ashes of saltwort (a plant burned to produce soda ash). The word entered English through medieval chemistry and found its landscape application in the American West, where alkali flats and alkali lakes marked the limits of habitation.
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