Manisan (Korean: 마니산) is a mountain in Incheon, South Korea.

It is situated in Ganghwa County and is the highest peak on Ganghwa Island.

Manisan has an elevation of 469.4 m (1,540 ft).

[1] There is a popular hiking trail to the summit; at the summit is Chamseongsdan, an altar where Dangun (the founding father of Korea) performed ritual ceremonies.

[2]