
橄欖岩 (Japanese Wikipedia) / CC BY-SA 3.0
Hokkaido
An active stratovolcano at the tip of the Kameda Peninsula east of Hakodate, still venting sulfurous steam from its lava dome. A short hiking trail crosses a barren, otherworldly crater plain within Esan Prefectural Natural Park to reach viewpoints over the Tsugaru Strait. Best timed for may-October for hiking; avoid winter for trail access.
Usual hours — confirm with the official site for holidays + seasonal closures.
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