Seagrass meadows cover far more of the ocean floor than scientists ever realized. A new AI-powered map shows the global extent of these underwater plants is roughly 4.8 million square kilometers, an area larger than the entire European Union.
The map that changes what we know about the seafloor
Researchers from the United States and Australia trained a machine learning model on millions of satellite images and field observations. The result is the first high resolution global map of seagrass distribution ever produced. Previous estimates relied on scattered data and guesswork. This new map pinpoints seagrass beds with unprecedented accuracy, revealing meadows in places where none were known to exist.
Why seagrass matters more than most people think
Seagrass is not just underwater grass. It is one of the planet's most powerful natural tools for fighting climate change. These meadows store carbon at rates up to 35 times faster than tropical rainforests. They also protect coastlines from erosion, filter pollution, and provide nursery habitat for fish, including commercially important species. Local fishing communities in countries like Indonesia, the Philippines, and Kenya depend on healthy seagrass for their livelihoods.
What the new data means for conservation
The map was created by a team led by scientists at the University of California, Los Angeles and the University of Queensland. They published their findings in the journal Nature. The project took years of computing time and required processing over two million satellite images. The team found that seagrass is present in waters off nearly every continent, but much of it remains unmapped by traditional methods. The new data gives governments and conservation groups a baseline to monitor losses and target protection efforts. Seagrass is disappearing globally at a rate of about 7 percent per year, a decline driven by coastal development, pollution, and climate change.
This map does not solve the problem of seagrass loss. But it gives scientists and policymakers something they never had before: a clear picture of what is at stake.
