The world's largest living organism is a clonal colony of seagrass called Posidonia australis, located in Shark Bay, Western Australia, covering approximately 200 square kilometers (77 square miles) [2]. This organism is estimated to be around 4,500 years old, having spread through underground clonal shoots from a single seed [2].

Additionally, another contender is the Pando aspen grove in Utah, which is also considered the largest living organism by mass, weighing around 6,600 tons and covering 43 hectares (106 acres) [3][4]. Meanwhile, the largest known fungal organism, Armillaria ostoyae, spans 965 hectares (2,385 acres) in Oregon [5][6].

Largest organisms - Wikipedia

What is the world's largest living organism?

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