Essex Wildlife Trust has three nature reserves in the Walden Countryside area:
West Wood, Sampford
A large oxlip wood with an excellent network of rides to walk. Great crested newts breed in the forest ponds. Visually somewhat marred by extensive use of metal deer-fencing and unnecessary planting of saplings in plastic tubes. See SSSI details.
Shadwell Wood, Ashdon
An oxlip wood with splendid displays of spring woodland flowers. An SSSI - see details
Harrison Sayer Reserve, Hadstock
A small grassland reserve on the edge of the old Hadstock WW2 airfield.