Agency:.Produced by the NFB in cooperation with Environment Canada.

Director, William Pettigrew ; producer, Barrie Howells, Colin Low ; executive producer, Peter Katadotis ; script, Robert Campbell ; photography, David De Volpi ; sound, Richard Nichol ; editing, Ted Remerowski ; sound editing, John Knight ; re-recording, Hans Peter Strobl ; commentary, Strowan Robertson ; music, Larry Crosley ; music recording, Roger Lamoureux.

Narration, Richard Thomas.

Recorded 1979.

The Mackenzie and Amazon valleys are 10 000 km apart and are ecologically distinct. Yet, in a subtle sense they are collaborating elements within the biosphere, the Earth's thin layer of living matter. In this film are seen two of the world's myriad river ecosystems and how they are linked within the biosphere.

Mode of access: World Wide Web.

Description based on online resource; title from title screen (National Film Board of Canada, viewed 2023-08-10).