Trou au Natron
... that the so-called "Tibesti Soda Lake" at the bottom of the Trou au Natron volcanic caldera is actually a mineral crust composed of sodium carbonate?
... that the so-called "Tibesti Soda Lake" at the bottom of the <b id="mwA4E"><a href="./Trou_au_Natron" id="mwA4I" rel="mw:WikiLink" title="Trou au Natron">Trou au Natron</a></b> volcanic caldera is actually a mineral crust composed of <a href="./Sodium_carbonate" id="mwA4M" rel="mw:WikiLink" title="Sodium carbonate">sodium carbonate</a>?