On what lunar plain did Apollo 11 land in 1969?

Apollo 11 landed on the Sea of Tranquility on July 20, 1969. The mission’s lunar module, Eagle, touched down in the region officially known as Mare Tranquillitatis.

Commander Neil Armstrong and lunar module pilot Buzz Aldrin descended to the lunar surface, while command module pilot Michael Collins remained in lunar orbit aboard Columbia. The landing occurred after a journey of roughly three days from Earth.

The site was selected partly because it appeared relatively flat and safe for landing. Earlier robotic missions, including Ranger 8, Surveyor 5, and Lunar Orbiter spacecraft, had collected information about the area. Armstrong manually guided Eagle away from a hazardous-looking patch near the planned landing area.

Apollo 11 was the first crewed mission to land humans on the Moon. Armstrong stepped onto the surface first, followed by Aldrin. The astronauts deployed scientific instruments, collected lunar samples, photographed the surroundings, and planted an American flag before returning safely to Earth.