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A guyot, also known as a tablemount or a seamount plateau, is an underwater mountain with a flat top or summit that is submerged beneath the ocean's surface. One famous example of a guyot is the Hawaiian-Emperor seamount chain, which stretches for more than 3,600 miles across the Pacific Ocean. The Emperor Seamounts are a series of guyots and seamounts that were formed by volcanic activity millions of years ago and are now submerged beneath the ocean's surface. Another example of a guyot is the Catoche Knolls, located in the Gulf of Mexico, which is believed to have been formed about 60 million years ago by volcanic activity.