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plant community ecoregion plant water leaf fluvial landforms of streams natural landscape waterfall body of water watercourse grass deciduous riparian zone formation landscape groundcover spring forest chute stream temperate broadleaf and mixed forest creek wildlife mountain river geology mountain woodland rock tree rapid escarpment water feature nature reserve riparian forest northern hardwood forest tropical and subtropical coniferous forests hill plateau valdivian temperate rain forest arroyo old-growth forest grassland non-vascular land plant algae ravine moss reflection autumn wetland wildflower