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.
Largest area covered by floating ferns
- Azolla japonica
- 9685 square metre(s)
- Japan Kasuga Town