Seaton Snook covers the north side of Tees Estuary forming part of the Teesmouth National Nature Reserve. This is a vast area of salt marsh and sandy beaches with a line of sand dunes separating the two areas. North Gare pier extends a short distance into the Estuary.
At this time of year these aggressive oppitunistic birds take up residence here, at least for a short while as the tent numbers are at their largest. Here they harass and chase the terns who have successfully caught fish ignorer to try and steal they quarry.