The world's largest organism is a single specimen of Posidonia australis seagrass, located in Shark Bay, Western Australia.
It covers approximately 200 square kilometres (77 square miles).
It is estimated to be around 4,500 years old.
It is a single genetic clone, which means it is all from the same plant that has spread through time.
It also helps to safeguard the coastline from erosion and storms.
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