Belluna Dome, also known as MetLife Dome in the past, is the home stadium of the Saitama Seibu Lions, located in Tokorozawa, Saitama, Japan. Known for its unique structure—partially open-air with a roof—it provides a distinct baseball experience that blends the indoors and outdoors. It offers not only thrilling baseball games but also seasonal events and scenic surroundings in Seibu-en area.