Manesun is a mountain located in the city of Incheon, and it is the highest peak on Ganghwa Island, and one of the fun activities you can do in it is to walk on hiking trails that reach the top, and when you reach the summit you will see the “Chamseongdan” altar where Dangun was. perform religious rites; From that point on the top of the mountain you will be able to enjoy stunning views of the sea and the distant horizon.