Mar de la Tranquilidad o Mare Tranquillitatis, es un extenso mar lunar donde el 20 de julio de 1969 el módulo lunar de la nave Apolo 11 descendió, junto con los astronautas Edwin Buzz Aldrin y Neil Armstrong, siendo este último la primera persona en pisar la superficie lunar, mientras que Michael Collins se quedó orbitando la luna en el módulo de mando. El lugar concreto del primer alunizaje se conoce como Base Tranquilidad. Su elección se debió a que el lugar era relativamente llano y grande, por lo que era el lugar apropiado para que la nave se pudiera posar.

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Mare Tranquillitatis (Latin for Sea of Tranquility or Sea of Tranquillity (see spelling differences)) is a lunar mare that sits within the Tranquillitatis basin on the Moon. The mare material within the basin consists of basalt formed in the intermediate to young age group of the Upper Imbrian epoch. The surrounding mountains are thought to be of the Lower Imbrian epoch, but the actual basin is probably Pre-Nectarian. The basin has irregular margins and lacks a defined multiple-ringed structure. The irregular topography in and near this basin results from the intersection of the Tranquillitatis, Nectaris, Crisium, Fecunditatis, and Serenitatis basins with two throughgoing rings of the Procellarum basin. Palus Somni, on the northeastern rim of the mare, is filled with the basalt that spilled over from Tranquillitatis. This Mare has a slight bluish tint relative to the rest of the moon and stands out quite well when color is processed and extracted from multiple photographs. The color is likely due to higher metal content in the basaltic soil or rocks. Unlike many other maria, there is no mass concentration (mascon), or gravitational high, in the center of Mare Tranquillitatis. Mascons were identified in the center of other maria (such as Serenitatis or Imbrium) from Doppler tracking of the five Lunar Orbiter spacecraft in 1968. The gravity field was mapped at higher resolution with later orbiters such as Lunar Prospector and GRAIL, which unveiled an irregular pattern. \n* Topographic map \n* Gravity map based on GRAIL

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