A 4,543-square-mile stretch of California’s central coast has received federal protection as the Chumash Heritage National Marine Sanctuary — the country’s third-largest marine sanctuary, the first in California in 30 years, and the first anywhere in the U.S. designed with meaningful involvement from Indigenous tribes.
At a glance
- Chumash Heritage National Marine Sanctuary: Officially designated by the National Oceanic and Atmospheric Administration, it spans 116 miles of coastline across San Luis Obispo and Santa Barbara counties, protecting one of the most biologically productive stretches of the U.S. Pacific coast.
- Indigenous co-design: Several Chumash tribal nations were involved in planning from the outset — a historic first for U.S. marine sanctuary designation, and a model other conservation efforts are beginning to follow.
- Submerged cultural sites: NOAA confirmed that ancient village locations along now-submerged paleoshorelines receive long-term legal protection under the new sanctuary regulations — a rarely acknowledged dimension of ocean conservation.
Why this stretch of ocean matters
The waters off San Luis Obispo and Santa Barbara counties sit at a rare ecological crossroads. Cold, nutrient-rich water driven up from the seafloor meets the warmer currents of the Southern California Bight, the curved arc of coastline that runs past the Channel Islands toward San Diego.
That collision of conditions produces extraordinary marine life density. Mati Waiya, executive director of the Wishtoyo Chumash Foundation, has compared the area to the Galápagos. The sanctuary includes a seamount and canyon descending to depths of 11,580 feet, and the seafloor holds what NOAA describes as possible ancient village sites from a time when sea levels were lower and these areas were dry land.
New protections bar oil and gas exploration and prohibit disturbance of the seafloor — measures that apply across the entire 4,543 square miles.
A decade of advocacy, led by tribal nations
The push to protect this coastline began in 2015, driven in large part by Chumash communities whose cultural and spiritual ties to these waters stretch back thousands of years. That decade of work ended with a result that has no precedent in U.S. marine conservation history.
“The designation of Chumash Heritage National Marine Sanctuary shows the United States’ commitment to environmental justice and equity,” said Violet Sage Walker, chairwoman of the Northern Chumash Tribal Council, one of several tribes involved in the sanctuary’s planning.
Kenneth Kahn, chairman of the Santa Ynez Band of Chumash Indians, framed the moment in longer historical terms. “Generations of U.S. land and water policies have placed Native Americans at a great disadvantage throughout our history,” he said in a NOAA news release. “Today’s announcement is a sign that things are changing.”
The designation also counts toward the Biden administration’s America the Beautiful 30×30 goal — a national commitment to protect at least 30% of U.S. lands and waters by 2030 C.E.
The boundary compromise that still stings
The sanctuary’s story includes a real and unresolved tension. Original plans called for the protected area to connect the existing Monterey Bay National Marine Sanctuary to the north with the Channel Islands sanctuary to the south — creating a continuous corridor of protected ocean along the California coast.
That vision was scaled back when federal planners shifted the northern boundary southward to avoid conflict with proposed offshore wind development near Morro Bay. Five tribal nations sent a formal letter to NOAA urging the original, larger boundary to be restored.
“We’ve been supporters of the marine sanctuary for many years, and we’re happy that there is a marine sanctuary, but we’re disappointed that it was reduced in size and leaves out some extremely important areas of our coast,” said Mona Olivas Tucker, tribal chair of the yak tityu tityu yak tiłhini Northern Chumash Tribe.
Tucker also acknowledged that “thousands of people globally and locally did support that marine sanctuary” — and that her tribe was among them. The outcome is a genuine milestone and an incomplete one at the same time.
What comes next for U.S. ocean protection
The Chumash Heritage designation arrives at a moment when the case for large marine protected areas is growing stronger. Peer-reviewed research has consistently shown that well-enforced marine sanctuaries rebuild fish populations, protect biodiversity, and increase the resilience of ocean ecosystems against warming and acidification.
What makes this sanctuary distinct is less its size than its origin story. A federally protected ocean area built from the ground up with Indigenous knowledge and tribal leadership sets a precedent that advocates say could reshape how the U.S. approaches conservation on both land and sea.
The waters the Chumash people have known for millennia now carry legal protection. That is a beginning — and, for many who fought for it, not yet enough.
Read more
For more on this story, see: San Francisco Chronicle
For more from Good News for Humankind, see:
- Ghana establishes a new marine protected area at Cape Three Points
- Indigenous land rights milestone: 160 million hectares recognized ahead of COP30
- The Good News for Humankind archive on marine conservation
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