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Brilliant Bloom in the Baltic Sea

An explosion in the numbers of cyanobacteria transformed the Baltic Sea into a swirling canvas of green in summer 2025.


NASA Earth Observatory images by Michala Garrison, using Landsat data from the U.S. Geological Survey. Story by Kathryn Hansen.

Published July 22, 2025
Data acquired July 20, 2025

Source:
Landsat 9 > OLI-2