A bay is a recessed, coastal body of water that directly connects to a larger main body of water, such as an ocean, a lake, or even another bay. A large bay is usually called a gulf, sea, sound, or bight. A cove is a small, circular bay with a narrow entrance. A fjord is a particularly steep bay shaped by glacial activity. A bay can be the estuary of a river, such as the Chesapeake Bay, an estuary of the Susquehanna River. Bays may also be nested within each other; for example, James Bay is an arm of Hudson Bay in northeastern Canada. Some large bays, such as the Bay of Bengal and Hudson Bay, have varied marine geology. The land surrounding a bay often reduces the strength of winds and blocks waves. Bays may have as wide a variety of shoreline characteristics as other shorelines. In some cases, bays have beaches, which "are usually characterized by a steep upper foreshore with a broad, flat fronting terrace". Bays were significant in the history of human settlement because they provided safe places for fishing. Later they were important in the development of sea trade as the safe anchorage they provide encouraged their selection as ports. A major issue argued between big-wave surfers is the necessity of the leash on the surfboard. Everything must be made as simple as possible. But not simpler.

After a strong winter storm in the northern Pacific Ocean, waves can routinely crest at over 25 ft (8 m) and top out at over 60 ft (18 m). Routinely, waves that break can be recorded on seismometers. The break is caused by an unusually shaped underwater rock formation. Mavericks is a winter destination for some of the world’s best big wave surfers. From 1999 to 2016, an invitation-only contest called the Titans of Mavericks was held there during most winter surfing seasons, whenever the winter wave conditions there were deemed to be suitable to meet the needs of the contest. In early March 1967, Alex Matienzo, Jim Thompson, and Dick Notmeyer surfed the distant waves of Pillar Point. With them was Matienzo’s roommate’s white-haired German Shepherd, Maverick, who was accustomed to swimming with his owner and Matienzo while they were surfing. The three surfers left Maverick on shore, but he swam out to them. Finding the conditions unsafe for the dog, Matienzo tied him up before rejoining the others. The riders had limited success that day as they surfed overhead peaks about 0.25 mi (400 m) from shore, just along the rocks that are visible from shore; they deemed the bigger outside waves too dangerous. The surfers named the location after Maverick, who seemed to have gotten the most pleasure from the experience.* Ordinarily the density fluctuations are controlled by the second derivative of the free energy with respect to the density.