There is a place in South Africa where a major river splits into numerous channels, one large, and several small. It does this because there is almost no sediment in the river valley, just rock, as is the case of much of South Africa, so when the river floods, the water just spreads out everywhere and can’t really change the channels around like rivers with soft mushy floodplains do. So, over the course of about 800 million years, the flooding river spread and found ancient “joints” — linear weak spots in the granite — and turned them into channels, and some of those channels have grown quite large.

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