Tiebao (Iron Fort) is a unique fort located on a separate reef by the sea in Ren’ai Village on Matsu’s Nangan Island. Once the base of an elite amphibious unit, the fort stands as a silent guardian of the sea. The road to Tiebao follows a winding coastal trail with magnificent ocean views. The fortress itself is a labyrinth of tunnels hewn from granite, with every corner revealing the courage and tension of a former military garrison.