Unai Lagua Japanese Defense Pillbox

The Unai Lagua Japanese Defense Pillbox is a World War II bunker at a beach on Saipan, built from poured concrete and coral blocks. The structure uses natural rock formations as part of its walls and blends into the surrounding landscape.

Japanese forces built this defensive position in 1943 during a time of limited resources as they prepared for possible attacks. The bunker is part of the larger defense system that Japan constructed on the strategically important island.

The fortification shows how soldiers during wartime repurposed local materials and wove them into their building methods. You can still see today how coral stones and natural rock became part of the structure.

The bunker sits along the beach and is reached by walking a coastal path at Unai Lagua Beach, also known as Parrot Fish Beach. Access is on foot along the shoreline, so wear sturdy shoes and watch the tides.

The blend of concrete and coral material made this fortification nearly invisible to aircraft and ships from above. This building method was a clever way to save resources while camouflaging the structure at the same time.