the fact it is on an island.
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Matthew Perry ended Japan's Isolation when the US sent him to Japan.
Japan's island location played a role in its development thanks to shipping trade routes
The mountains of Japan and the location of Japan helped lead to some isolation.
Japan's two-and-a-half-centuries of self-imposed isolation resulted in an increase in domestic trade and agricultural production. The shogunate imposed this policy of isolation in order to remove the colonial and religious influence of Spain and Portugal.
They feared Europe was using religion to gain political influence.
Japan's isolation was primarily influenced by its geographic features, particularly its mountainous terrain and surrounding oceans. The rugged mountains made land travel difficult, while the Pacific Ocean, the Sea of Japan, and other bodies of water acted as natural barriers, limiting outside contact. This geographic isolation fostered a unique culture and society, allowing Japan to develop independently for centuries until the mid-19th century.
Japan got little influence and input from the outside world so that gave it a chance to develop based on its own culture, traditions, customs and views. Hope this helped!
Mt Fuji is a large geographical feature and cannot be removed from the place it is located. The only way to "take it out" of Japan would be to create another sovereign country in the territory around it.
Mt.fuji a physical feature of japan