 Part of Gunners Park is Shoeburyness Old Ranges Local Nature Reserve (called Shoebury Ranges by the EWT), 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.Shoeburyness Old Ranges has flora unique in the county, on a habitat of unimproved grassland over ancient sand dunes.