Mare Fecunditatis, or the "Sea of Fertility," is a large lunar mare located on the Moon's surface. It is part of the Moon's eastern hemisphere and is characterized by its smooth, dark basaltic plains formed by ancient volcanic activity. This area covers approximately 1,200 kilometers in diameter and is one of the prominent features visible from Earth. The mare was named by the International Astronomical Union in 1970, reflecting its historical significance in lunar studies. Mare Fecunditatis is surrounded by several craters, including Langrenus and Fecunditatis, which provide insights into the Moon's geological history and the impact processes that shaped its surface.