Multiple choice general knowledge What is the significance of the word " Sea of Tranquility " ? Place on Moon Large inland seas Place on Mars Dead sea Reveal answer Fill a bubble to check yourself A Correct answer Explanation The Sea of Tranquility (Mare Tranquillitatis) is a lunar mare on the Moon, not an actual sea. It was the landing site of Apollo 11, the first manned Moon landing. It is not on Mars, not a Dead Sea reference, and not an inland sea on Earth.