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Ma're Tyr•rhe'num



Pronunciation: (ti-rē'num), [key]
(Tyrrhenian Sea) an area in the southern hemisphere of Mars, appearing as a dark region when viewed telescopically from the earth.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

Mare TranquillitatisMare Undarum

 

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