Largest area covered by floating ferns

Largest area covered by floating ferns
Who
Azolla japonica
What
9685 square metre(s)
Where
Japan (Kasuga Town)
When

The largest recorded area of water entirely covered by the same fern, red Azolla japonica, measured 9,685 m² (104,284 ft ²), when measured in January-June 2000. The fern was floating on the Furukawa-Sawanoike Pond, Kasuga Town, Japan.