While remote islands like Yonaguni are the westernmost points of Japan as a nation, Kozakibana is specifically the westernmost point of the contiguous mainland.
The park features a symbolic monument shaped like a compass or arrow to highlight its unique geographical positioning.
The location provides a direct line of sight across to Hirado Island, a region historically significant for early Japanese-European trade.
The coastal geography here is characterized by complex ria shorelines, typical of the Nagasaki coastline.
Kozakibana Park is the officially designated westernmost point of Mainland Japan, situated in Sasebo, Nagasaki. The site features a monument marking its geographical significance as the extremity of the main island of Honshu, Kyushu, Shikoku, and Hokkaido collective. It sits at the tip of the Kosaza Peninsula, overlooking the waters of the Hirado Strait. The area is maintained as a coastal park, offering panoramic views of the Kujuku Islands. Visitors can access a small observation deck and a stone plaque denoting the exact coordinates. The site remains a quiet geographical landmark rather than a commercial tourist attraction.
The monument plaque at the edge of the observation deck with the strait and Hirado Island in the background.
Wear sturdy walking shoes as the terrain around the observation point can be uneven.
Bring sun protection as the park is fully exposed to the elements with very little natural shade.
Check local weather forecasts specifically for high wind conditions, as the exposed coastal location can be gusty.
Do not attempt to walk to the exact water's edge if the trail is marked closed, as the cliffside paths can be unstable.
