Ingrebourne Marshes are a 74.8 hectare biological Site of Special Scientific Interest in Hornchurch in the London Borough of Havering. Ingrebourne Valley Local Nature Reserve includes a small part of the SSSI west of the River Ingrebourne. The site is managed by the Essex Wildlife Trust
Frays Farm Meadows is a 28.2-hectare (70-acre) biological Site of Special Scientific Interest near Denham in the London Borough of Hillingdon. It was notified as an SSSI in 1981, and has been managed by the London Wildlife Trust on behalf of Hillingdon Council since 1999. It is part of the Colne Valley Regional Park.
Cranham Marsh is a 15.3 hectare Local Nature Reserve and a Site of Metropolitan Importance for Nature Conservation in Cranham in the London Borough of Havering. It is owned by Havering Council and managed by the Essex Wildlife Trust.
Great Wood and Dodd's Grove is a 36.8-hectare (91-acre) biological Site of Special Scientific Interest in Leigh-on-Sea in Essex. It is also a Local Nature Reserve called Belfairs. Essex Wildlife Trust runs the Belfairs Woodland Centre and manages the site together with Southend-on-Sea City Council.
Welsh Wood is a 3.2 hectare Local Nature Reserve in Colchester in Essex. It is owned and managed by Colchester Borough Council.
Bocking Blackwater is a 13.1 hectare Local Nature Reserve in Braintree in Essex. It is owned and managed by Braintree District Council. In 2016 the council proposed to extend the boundaries of the site.
Gosfield Sandpits is an 8.3 hectare Local Nature Reserve in Gosfield, north of Braintree in Essex. It is owned by Gosfield Parish Council, and managed by the Parish Council and Braintree District Council.
Hoppit Mead is a 9.2 hectare Local Nature Reserve in Braintree in Essex. It is owned and managed by Braintree District Council.
Belcher's and Broadfield Woods is a 14.4-hectare (36-acre) biological Site of Special Scientific Interest between Halstead and Braintree in Essex. It is managed by the Essex Wildlife Trust as the Brookes Nature Reserve.
Roughtalley's Wood is a 3.4 hectare Local Nature Reserve in Theydon Garnon parish in Essex, England. It is owned and managed by Epping Forest District Council.
Belton Hills is a 22 hectare Local Nature Reserve in Leigh-on-Sea in Essex. It is owned and managed by Southend-on-Sea City Council.
Marylands is a 3.7 hectare Local Nature Reserve in Hockley in Essex. It is owned by Rochford District Council and managed by Hockley Parish Council.
Whet Mead is a 10.1 hectare Local Nature Reserve in Witham in Essex. It is owned and managed by Braintree District Council.
Harlow Woods is a 47.1-hectare (116-acre) biological Site of Special Scientific Interest in Harlow in Essex. It is composed of three woods, Hospital Wood Risden's Wood and Parndon Wood. They are owned and maintained by Harlow District Council, and they are part of the slightly larger Parndon Woods and Common Local Nature Reserve.
Hockley Woods is a large woodland in south-east Essex. It is a Local Nature Reserve, and parts are a Site of Special Scientific Interest. It is owned and managed by Rochford District Council.
Grove House Wood is a 2.2 hectare Local Nature Reserve in Stanford-le-Hope in Essex. According to Natural England, it is owned by Thurrock Council and managed by Essex Wildlife Trust but it is not listed on the web site of either body.
Hilly Fields is a 37.5 hectare Local Nature Reserve in Colchester, Essex. It is owned and managed by Colchester Borough Council. It is also a scheduled monument as it is in a late Iron Age site and Roman Camulodunum.
Linford Wood is a 3.5-hectare (8.6-acre) Local Nature Reserve in East Tilbury in Essex. It is owned and managed by Thurrock Council.
Gunners Park and Shoebury Ranges is a 25 hectare nature reserve in Shoeburyness in Essex. It is managed by the Essex Wildlife Trust (EWT). Part of Gunners Park is Shoeburyness Old Ranges Local Nature Reserve, which is itself part of the Foulness Site of Special Scientific Interest. At the eastern end of Gunners Park is the Danish Camp, a Scheduled Monument.
