[5] It was probably formed by a combination of retreating glaciers creating a kettle hole and subsidence caused by the underlying rock salt dissolving away.

[5] Nutrient levels have risen as a result of inflow from surrounding farmland and streams and because of the droppings from large numbers of roosting birds.

[5] Around the edge are areas of birch and willow and reedbeds with common reed, lesser reedmace and sweet flag.

[4] The woodland consists mainly of oak and has patches of wood sorrel, yellow archangel and early purple orchid at ground level.

[4] According to legend, Rostherne Mere is the home of a mermaid, who can sometimes be heard ringing a sunken bell beneath the water.