the Sea of Tranquility (lunar region)

The Sea of Tranquility, or Mare Tranquillitatis, is a large, flat basaltic plain on the Moon’s surface formed by ancient volcanic flows. It appears darker than surrounding areas, hence the name "Sea," though it contains no water. This region is notable for being where Apollo 11 astronauts first landed in 1969, marking the first crewed moon landing. Its relatively smooth terrain made it ideal for landing spacecraft, and it offers scientists insights into lunar volcanic activity. The Sea of Tranquility remains a significant site for lunar exploration and scientific research.