We need to remember that the author of this incredible classic was the wife of the famous Romantic poet, Shelley, and so it is not surprising that there are similar Romantic themes in this novel. Key to Romanticism was the way that Nature was able to "heal" man and provide solace in his darkest moments. We can see this idea again and again when Victor goes into Nature and seeks it precisely so that he can find rest and relaxation from his concerns and worries about his creature. An excellent example of this comes at the beginning of Chapter Ten:
These sublime and magnificent scenes afforded me the greatest consolation that I was capable of receiving. They elevated me from all littleness of feeling and although they did not remove my grief, they subdued and tranquilised it. In some degree, also, they diverted my mind from the thoughts over which it had brooded for the last month.
Note how Nature is something that is depicted as healing and sustaining Victor Frankenstein, and this is a theme that appears in other parts of the novel, too. The beauty of nature seems to stand in contrast to Victor's scientific endeavours, that exhaust him and make him ill. The powers of reason are thus contrasted with the powers and delights of Nature.