natural monument
A natural feature or area designated for protection under Japanese law, such as a geological formation, ancient tree, or habitat.
This giant tree is designated as a national natural monument.
protected species; protected habitat
Used for animals, plants, or habitats legally protected as natural monuments; often appears in news and conservation contexts.
That bird is a protected species, so you must not catch it.
This forest has been designated a national natural monument.
Local residents are protecting the natural monument.
historic sites, places of scenic beauty and natural monuments