The separate strands of the Rakaia River wend toward the distant sea. Braided rivers form when sediment and gravel build up on the riverbed. Eventually the build-up becomes so high that the water, seeking the lowest path, begins to flow down a new channel. In this way the streams of a braided river are constantly moving across their wide bed.
Using this item
Photograph by Lloyd Homer
Permission of GNS Science must be obtained before any use of this image.