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Sinuous channels in (A) intertidal mudflat channels near Seoul, South Korea; (B) river channels in bedrock southwest of Moab, Utah; (C) a migrating reach of the Ellis River in Maine; (D) digital elevation model of submarine channels offshore of Rio Doce, Brazil; (E) relict fluvial channel patterns in the Aeolis Planum on Mars; and (F) a lunar volcanic rille in the Vallis Schröteri. (See Table S1 for locations and image credits in this and other figures.)
