[3] The name Manko is pronounced the same as a crude Japanese word for female genitals, resulting in some controversy.

[4] Lake Man is an area of brackish water at almost the same elevation as sea level.

It has also become a relay point for migrating birds such as shorebirds and plovers, and in 1999 was designated a wetland of international importance under the Ramsar Convention.

[5] A number of threatened species inhabit Lake Man, such as the shellfish Macoma nobilis, which is found only on Okinawa Island.

[2] Deposition of sediments and the worsening of water quality due to the influx of wastewater are among the problems facing these wetlands.