The largest living organism in the world, according to mass, is **Pando**, a clonal colony of the quaking aspen tree (Populus tremuloides) located in Utah. Pando is estimated to weigh collectively 6,000 tonnes (6,000,000 kg) and spans 43.6 hectares (108 acres) with approximately 47,000 individual stems, all connected by a single root system [2]. 

In terms of area, the largest known clonal organism is the giant marine plant **Posidonia australis**, found in Shark Bay, Australia, covering about 200 km² (77 sq mi) [1].

What is the largest living organism?

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