Posidonia is a genus of seagrass found in shallow coastal waters, primarily in the Mediterranean Sea and along the coasts of Australia. These underwater plants play a crucial role in marine ecosystems by providing habitat and food for various marine species, including fish and invertebrates. They also help stabilize the seabed and improve water quality by filtering pollutants. Additionally, Posidonia meadows are important for carbon sequestration, as they capture and store carbon dioxide from the atmosphere. This process contributes to mitigating climate change. The health of Posidonia meadows is vital for maintaining biodiversity and supporting local fisheries.