What natural phenomenon is often associated with large waves?

A tsunami is a natural phenomenon that is specifically characterized by large waves, often resulting from underwater seismic activity like earthquakes, volcanic eruptions, or landslides. These waves can travel across entire ocean basins and increase in height as they approach coastal areas, leading to significant destruction and loss of life upon landfall.

While flooding can result in the inundation of land, it does not inherently involve the characteristic waves of a tsunami. Tides refer to the regular rise and fall of sea levels caused by the gravitational forces exerted by the moon and sun, which is a different process altogether. Hurricanes can generate large waves and storm surges, but the waves associated with hurricanes are not classified in the same category as tsunami waves, as they are driven by wind rather than seismic activity. Thus, the association of tsunamis with large waves is unique and specific, making it the correct answer.