Teesmouth, is known throughout the birdwatching fraternity for having some very good wetland sites, which are often situated between the chimneys of chemical and petrochemical plants. The photograph above shows the "Rec" (Reclamation) pond, this is a brackish pool with some good muddy edges. The pool is also very shallow which makes it a good roost for gulls and terns. These pools are often the result of the leaching of salt from deposits deep underground on the reclaimed land near the remaining Tees estuary. The muddy edges are attractive to waders and other migrating birds. Teesmouth acts as a feeding stop over on the birds movements to either wintering or summering grounds.