IT's Big in Japan is a phrase that refers to something that is popular in Japan, but not necessarily elsewhere. Two examples of this are Fuji and SUMO. Fuji is a mountain located on the island of Honshu in Japan and is the country's highest peak. It is an iconic symbol of Japan and is often featured in art and literature. SUMO is a traditional Japanese sport that involves two wrestlers competing in a ring. It is considered a national sport in Japan and is very popular among spectators.