Mare Tranquillitatis on the Moon Map
Mare Tranquillitatis
| Feature type | Sea |
| Size (km) | 350 |
| Coordinates (latitude, longitude) | 8.4, 30.8 |
Mare Tranquillitatis - Lunar Mare
Mare Tranquillitatis is a lunar mare located on the Moon's near side, famous as the landing site of Apollo 11, the first manned mission to the Moon. The mare is a large, dark basaltic plain formed by ancient volcanic eruptions.
The mare has a diameter of approximately 873 kilometers and is surrounded by the Sea of Serenity to the northwest and the Sea of Fertility to the southeast.
Mare Tranquillitatis is estimated to be around 3.6 billion years old, and its relatively smooth surface is a result of lava flows that filled the basin after the impact.
Moon Surface Features Facing Earth
Dark basaltic plain where Apollo 11 landed in 1969, known as the 'Sea of Tranquility'.
A dark plain called the 'Sea of Fertility,' visible from Earth with a telescope or binoculars.
Mare Serenitatis
Sea
Round, dark plain adjacent to Mare Tranquillitatis, formed by ancient volcanic activity.
Apollo 14 landing site
Landing Site
1971 mission landing near Fra Mauro, a hilly region from Imbrium impact.
Apollo 17 landing site
Landing Site
1972 mission, last crewed Moon landing; explored Taurus–Littrow valley.
Apollo 15 landing site
Landing Site
1971 mission to Hadley Rille near Apennine Mountains; first use of lunar rover.
We acknowledge the resources provided by
Solar System Scope
for high-resolution planetary textures, and the
Gazetteer of Planetary Nomenclature
for official planetary naming data. We remain responsible for any errors in their use.