He had worked with Joseph Strick on The Savage Eye, and Strick co-produced two documentary films directed and written by Couffer, including Ring of Bright Water (1969) and The Darwin Adventure (1972).
Der Ring des Nibelungen | water | Bright Eyes | Clean Water Act | Water | Bright Eyes (band) | John Bright | Bright's disease | Ring of Honor | The Fellowship of the Ring | The Ring (magazine) | San Carlos Water | Ring of Fire | Hot Water Music | The Ring | Smoke on the Water | Ring | The Lord of the Rings: The Fellowship of the Ring | ''The Ring'' | Bull Ring, Birmingham | water supply | Water Street | The Promise Ring | Ring 2 | mineral water | drinking water | Water polo at the 2008 Summer Olympics | Twin Ring Motegi | Secret Water | Ring Round the Moon |
In 1969, Clark made his final film, Ring of Bright Water, playing the Storekeeper in the film about otters which starred real-life couple Bill Travers and Virginia McKenna.
In the film version of Gavin Maxwell's Ring of Bright Water, Bill Travers uses a copy of Thesiger's The Marsh Arabs to covertly spy on his soon-to-be close companion, Mij the otter.