Flexi Says: Where can a surfer ride waves that are 60-feet tall and jump up out of nowhere? Waves that are so big they shake a nearby seismograph are called Mavericks. In Northern California has the biggest gnarliest waves in the contiguous U.S. Mavericks is just north of Half Moon Bay in California. With one-half mile of surfing wave that jumps up almost out of nowhere. Waves at Mavericks can be as tall as a 4-story building. Mavericks is not for the faint of heart. At least two of surfing's biggest stars have died there.