A 33-year-old ultra-endurance athlete, Catherine Breed, has completed a remarkable 900-mile swim along the entire coast of California, finishing her journey in 111 days on October 16 at Coronado Beach in San Diego. This unprecedented feat began on July 1, when Breed dove into the waters at California's northern border.

Breed, a Bay Area native, shared her experience with the San Francisco Chronicle, stating, "For months, I measured my world in the next few miles," as she navigated the ocean alongside "whales beneath me, plastic beside me."

This record-breaking swim is a culmination of three years of planning, following her previous accomplishments, including swimming the English Channel in 2018 and the North Channel in 2019. Breed likened her daily challenges to completing a trail 50k or a half Ironman every day.

The swim aimed not only to test her endurance but also to promote environmental preservation and encourage women and girls to engage with the ocean. Accompanied by a shipboard support team, Breed swam approximately 10 miles daily, while also hosting events with ocean conservation groups along the coast.

One of the most significant challenges arose at the end of her journey, as she swam through the polluted waters near Imperial Beach, which she described as "some of the dirtiest water in the United States, if not the world."

Throughout her swim, Breed faced the effects of Super El Niño weather, contending with dangerous waves and currents that worked against her. She navigated waves as high as 7 feet, comparing the experience to swimming "in a washing machine."

A former long-distance swimmer for the University of California, Berkeley, Breed transitioned to open water swimming after college and has set records for various swims, including the length of Lake Tahoe and the Golden Gate Bridge to Half Moon Bay.

Reflecting on her journey, Breed emphasized the importance of respecting the ocean, stating, "You cannot bring hubris or expectations into the ocean... Your only job is to put one arm in front of the other and be at peace with whatever the ocean gives you that day."