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stream river water rocks stones boulders plants flowers trees shrubs bushes leaves branches trunks roots soil dirt mud sand gravel pebbles cobblestones boulders rocks stones waterfall rapids cascades pools eddies riffles runs channels tributaries estuaries deltas meanders oxbows cut banks point bars islands peninsulas capes promontories headlands bays gulfs fjords sounds straits channels passes narrows rapids cascades waterfalls pools eddies riffles runs channels tributaries estuaries deltas