Mangsan Mountain (293.5m), located in Dueok-ri, Hansan-myeon, Hansan-do, Tongyeong-si, is a place where you can both hike and explore ruins because it is a hiking trail in the island area and the ruins of Yi Chungmugong are scattered throughout it. When you climb to the top of the mountain, you can see at a glance not only the beautiful islands of Hallyeohaesang National Park dotted to the east, west, and south, but also the scene of the Battle of Hansan that saved the country. The characteristics of the Mangsan hiking trail are that it is not only convenient for transportation, but also provides easy access to things to see and eat, and allows you to enjoy the best pine forest bathing in the country.