Mare Nectaris, or the Sea of Nectar, is a large lunar mare located on the Moon's surface. It is one of the darker regions, formed by ancient volcanic activity. This area covers about 222,000 square kilometers and is characterized by its smooth basalt plains, which were created by lava flows. The mare is surrounded by several prominent craters, including Craters Theophilus, Craters Cyrillus, and Craters Catharina. These craters provide insight into the Moon's geological history and the impact events that shaped its surface. Mare Nectaris is also notable for its relatively young age compared to other lunar features, estimated to be around 3.9 billion years old.