[1][2] Tollesbury Wick Marshes is part of the Blackwater Estuary Site of Special Scientific Interest.

Areas of ungrazed rough pasture have badgers, and field voles and pygmy shrews are hunted by hen harriers and short-eared owls.

[1] The shore of the marshes is within the Blackwater, Crouch, Roach and Colne Estuaries Marine Conservation Zone.

[3][6] The marshes were once part of a salt production industry during the Iron Age and Roman periods, and Red hills created by this process are found across the area.

In 2015 a project was completed creating a sculpted landscape, watered from a newly constructed reservoir, supporting wildlife habitats well.