Ulleung-do is an island east of mainland South Korea. It’s home to the rugged Seonginbong Mountain Range, with forested foothills and the often fog-covered summit of Seonginbong Peak. The 3-tiered Bongnae Waterfall, a source of drinking water, is east of the range. The Haengnam Coastal Walking Path hugs part of the island’s east coast, winding along cliffs and past caves to Dodong Lighthouse, with expansive views.