Wells-next-the-sea is so-called because salt marshes, the subject of this film, have cut Wells off from the open sea, however water comes and goes every tide. This film sponsored by Norfolk County Council in partnership with Wells Field Study Centre uses time-lapse photography to show the marshes appearing as the tide goes out and the water recedes, condensing hours into seconds. The marsh, covered with plant life, gives students the opportunity to do field work.