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water water resources plant natural landscape waterfall bedrock fluvial landforms of streams vegetation watercourse chute formation landscape spring groundcover geological phenomenon outcrop forest riparian zone grass water feature non-vascular land plant mountain river stream tree font geology hill station rock mountain creek temperate broadleaf and mixed forest jungle escarpment nature reserve old-growth forest vascular plant rapid fault tropical and subtropical coniferous forests valdivian temperate rain forest rainforest moss adventure ravine riparian forest arroyo trunk klippe algae erosion