What is the comparative form of nature?

The word "nature" doesn't have a comparative form. It's a noun, and nouns don't have comparative or superlative forms.

If you're looking to compare aspects of nature, you'd need to use an adjective or adverb that describes those aspects. For example:

* More beautiful: "This view is more beautiful than the last one."

* More wild: "The mountains are more wild than the plains."

* More peaceful: "The forest is more peaceful than the city."