30km deep canyon in Central Europe

Let's suppose that there is a canyon, several hundred kilometers in length, stretching from Leipzig to Geneva and reaching the depth of 30 kilometers. It is up to 60 kilometers wide, cutting through the Thuringian Forest, separating Franconia and Swabia in half and forming an abyss between the Alps and the Jura Mountains. Its presence is the only distinction from the real world; all geomorphological features not affected by it exist in their real forms. There is a sea at the bottom; its level is 27 kilometers below absolute sea level. Hygromagnetic Handwavium-Phlebotium(TM) rock magically removes all water surplus to that threshold; rivers and creeks exist in the canyon. The slope is fairly smooth, beset by some cliffs.

My question is:

• How would the canyon look from space? What would be the climate inside it and how would it affect the climate of the world; how would vegetation and animal life look (and what would be the lowest height of survival, if applicable)?

posted over 6 years ago

MedwedianPresident‭

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