The area encompassing the present park mostly fell within the territory of the former Sasebo Naval District of the Imperial Japanese Navy .
The area encompassing the present park mostly was regarded as a strategic zone in which photography was strictly prohibited , and visitation by outsiders was discouraged .
The area encompassing the present park mostly fell within the territory of the former Sasebo Naval District of the Imperial Japanese Navy , and was regarded as a strategic zone in which photography was strictly prohibited , and visitation by outsiders was discouraged .