Reference: commons.wikimedia.org/wiki/File:Halla01.JPG
See the majestic 'Baengnokdam Lake' crater lake at the summit
This dormant volcano, a UNESCO World Natural Heritage Site, stands at approximately 1,950 m in height. The mountain supports a wide range of biodiversity, from boreal to alpine plants and animals, and the summit is home to Baengnokdam Lake, which is famous for its massive crater lake. Because of the mountain's height and ruggedness, it is recommended that you bring hiking boots and drinking water. Some trails have limited access, such as limited climbing times and advance reservations, so find out more before you go.
Reference: whereismynextadventure.com/2015/12/12/hiking-mt-hallasan/comment-page-1/
Hallasan Seongpanak Trail
Trail for 'Baengnokdam', the longest of the Hallasan trails
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Hallasan Eorimok Trail
Trail that goes through the Eorimok Valley to the Nambyeok Junction
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Hallasan Yeongsil Trail
Popular Hallasan climbing course with a variety of attractions and flat terrain
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Hallasan Gwaneumsa Trail
8.7-kilometer-long trail that leads to the top of Hallasan National Park's summit, Baengnokdam Lake
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Hallasan Donnaeko Trail
7.7-kilometer-long trail through evergreen, deciduous, and boreal forests
Reference: lifeinbirmingham.blogspot.com/2011/04/seoul-day-6.html
Hallasan Eoseungsaengak trail
1.3-kilometer-long trail that offers a panoramic view of 'Biyangdo Island' and 'Seongsan Ilchulbong Tuff Cone' in good weather
Reference: commons.wikimedia.org/wiki/File:Abies_koreana_Halla_San_1.jpg?uselang=aa
Hallasan Seokgulam Trail
1.5-kilometer-long trail where you can enjoy a light stroll in a forest of pine and broadleaf trees