Hallasan, on Jeju Island, is the tallest volcano and mountain in South Korea. Despite its stature, its still scalable by nontechnical climbers, though its a nine-hour round-trip <a href="https://www.menshealth.com/trending-news/a19538395/best-hiking-boots/" id="e6aa7a6e-2c86-31aa-a2f2-414ed07b5e5f"> hike </a> .
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