What is defined as breaking seas exceeding 8 feet?

The term that refers specifically to breaking seas exceeding 8 feet is "surf." Surf occurs when ocean waves, driven by wind and other forces, approach the shore and become so steep that they break with significant force. This phenomenon typically happens in shallow water and results in the foamy, turbulent water that can be dangerous for boats and swimmers alike.

In contrast, swells refer to longer, rolling waves that are often caused by distant weather systems and do not break until they approach the shore. Waves encompass a broader category but do not specifically denote those that are breaking, while wind-driven seas describe conditions where waves are influenced primarily by local winds, which may or may not reach the height of 8 feet.