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natural landscape body of water nature water resources watercourse stream water vegetation nature reserve natural environment forest old-growth forest riparian zone biome tree tropical and subtropical coniferous forests creek rainforest waterfall valdivian temperate rain forest mountain river riparian forest river wilderness jungle woodland landscape fluvial landforms of streams plant arroyo tributary temperate broadleaf and mixed forest moss rock national park ravine state park branch stream bed rapid vascular plant water feature spring temperate coniferous forest non-vascular land plant