This is the RSPB reserve on the Freiston shore. It is a place where migrating birds stop and rest, some stay and breed. For centuries people have been claiming land from the salt marshes along the coast of south Lincolnshire. They built walls to protect the land. Eventually these were breached by the sea and in a bid to protect the habitat a new wall was built and a small lagoon formed.
If you look carefully behind the trees aroudn three thirds to the right of the picture, you will see 'The Stump' - the tower of the Boston Church - which calims to be the tallest chirch tower in England - 83 metres. The landscape around Boston is immense and is flat like a billiard table at the sea level.