Tamu Massif

An underwater volcano was found about 1,000 miles east of Japan. They call it Tamu Massif. It is the new largest volcano in the world and is also one of the largest in the Solar System. A professor at the University of Huston, William Sager took a team of other scientist to discover this volcano. "Its shape is different from any other sub-marine volcano found on Earth, and it's very possible it can give us some clues about how massive volcanoes can form," Sager stated. They say that it is 145 million years old and became active within a couple million years after it was formed. Mauna Loa, the largest active volcano is approximately 2,000 square miles, that is nothing compared to Tamu Massif. About 120,000 square miles is the area that this new volcano covers. This all ties together with the French word "massif" meaning massive, or in a scientific matter it means large mountain mass. 

http://www.cnn.com/2013/09/06/world/biggest-volcano/index.html?hpt=wo_c2