“On either side
Is level fen, a prospect wild and wide,
With dykes on either hand, by ocean self-supplied.
Far on the right the distant sea is seen,
And salt the springs that feed the marsh between;
Beneath an ancient bridge the straitened flood
Rolls through its sloping banks of slimy mud;
Near it a sunken boat resists the tide,
That frets and hurries to the opposing side;
The rushes sharp, that on the borders grow,