Blue House Farm is a 242.8-hectare (600-acre) nature reserve and farm in North Fambridge, on the north bank of the River Crouch between Burnham-on-Crouch and South Woodham Ferrers in Essex.

[2] This site has been grassland for the last 100 years, and it is grazed by cows and sheep.

The site has ponds, creeks and ditches, and a 20 hectare field is flooded during the winter, providing feeding grounds for large numbers of wildfowl and wading birds, including around 2000 Brent geese.

Other winter birds include lapwings, golden plovers and dunlins, while there are spring migrants such as green sandpipers and spotted redshanks, and breeding birds such as skylarks and meadow pipits.

Mammals include water voles and hares, and many butterflies.