Unlike the border on land, the division of Korea continues into a sea where no line can be seen.

In the Yellow Sea, the Northern Limit Line, or NLL, has functioned as a de facto maritime boundary between North and South Korea since the years following the 1953 Armistice. The line was never agreed upon by both sides, and its contested waters have remained a recurring source of military tension.

There are no fences across the water. The boundary exists through patrols, observation posts, naval vessels, coastal fortifications, and the constant surveillance of an apparently open sea. Islands close to the line have become forward positions, where everyday life exists alongside a permanent military presence.

This series looks at a border that is invisible yet constantly enforced—a line drawn across water, where an empty horizon can carry the weight of division.