RSPB Saltholme is a nature reserve located on the estuary of the River Tees between Haverton Hill and Seal Sands in County Durham, England. [1] It was opened in March 2009. [2] Situated across 1,000 acres, is the largest bird sanctuary operated by the Royal Society for the Protection of Birds. [2] The land is owned by the Teesside Environment Trust.
Saltholme was originally salt marsh. [1] It was reclaimed as agricultural land. [1] Salt was mined on the site from the 1820s. [1] Bell Brothers of Middlesbrough used boreholes to mine salt from 1882. ICI donated the land to the Teesside Environment Trust in the early 1990s.