What geographic features enabled japan to pursue a policy of isolationism?

Unshared international borders and the impassable seas during the monsoon were the geographic features that enabled Japan to pursue isolationism.

Explanation:

The geographic location of Japan suggests that its remoteness is natural in all means. The country of Japan resides on a series of islands closely spaced. Though these islands are in close proximity to China and the Korea, passing the seas that lie between Japan and these countries was not an easy task, especially when the monsoons were on the zenith.