- First published
- Oct 14, 2026
Seosan Haemieupseong Fortress
A Joseon-era military and administrative fortress built from 1417 to 1421 in Haemi, Seosan. Explore the gate, walls, reconstructed prison and old pagoda tree. Some wall stones bear the names of towns responsible for construction. The site also carries painful memories of Catholic persecution.
- Address
- 143 Nammun 2-ro, Haemi-myeon, Seosan-si, Chungcheongnam-do, South Korea (서산 해미읍성)
- Hours
- Seosan City's published hours: Mar–Oct 05:00–21:00; Nov–Feb 06:00–19:00. Page last updated 2023-01-16. Recheck temporary restrictions, events and tours with +82-41-661-8005.
November falls within Seosan City's published winter visiting-hours period. The official page was last updated in January 2023; reconfirm any temporary restrictions and current access before a 2026 visit.
Why go
Look for town names carved into the wall stones around the main gate. The reconstructed prison and old tree invite reflection on Joseon administration and religious persecution. Confirm any performances or activities before setting out.
Plan the visit
Use the confirmed place facts below, then continue to the broader travel guides for transport, facilities and eating practicalities.