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The natural world, encompassing all living organisms and natural phenomena not created by humans.
自然界のバランスを保つことは重要だ。
It's important to maintain the balance of the natural world.
Refers to ecosystems, wildlife, and natural processes.
In ecological discussions, 自然界 often contrasts with human-made environments.
Do not use 自然界 to refer to human-made or artificial things.
Composed of 自然 (shizen, 'nature') and 界 (kai, 'world' or 'realm').
Often used in ecological, scientific, or philosophical contexts to refer to the non-human world.