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Geopolitics

Why China is building islands in the South China Sea

A deep dive into the maritime data, dredging logs, and military strategy reshaping the borders of the Pacific Ocean.

Editorial Board | Oct 24, 2026 | 14 min read
Satellite imagery matched with AIS tracking data.

Looking at a standard political map of the world, borders seem fixed. Thick black lines separate nations, grounded in treaties and physical geography. But look at the South China Sea, and those lines begin to blur, overlap, and disappear entirely into the water.

Over the last decade, a massive engineering project has been underway. Using specialized dredging ships, millions of tons of sand and coral have been sucked from the ocean floor and piled onto submerged reefs. The result? New land where there was none before.

The Scale of Expansion

3,200+ Acres

Total new land created in the Spratly Islands since 2013, supporting military-grade runways, deep-water ports, and radar installations.

The motivation isn't merely to create new real estate. It's about establishing sovereign territory. According to the United Nations Convention on the Law of the Sea (UNCLOS), a country's territorial waters and exclusive economic zones (EEZs) are determined by their land borders.

The Nine-Dash Line

If you project a 200-nautical-mile EEZ from these newly constructed islands, you effectively draw a circle of control over one of the most vital shipping lanes on the planet. Over $3 trillion in global trade passes through these waters annually.

This is where the data tells the real story. By tracking the AIS (Automatic Identification System) signals of dredging vessels over a five-year period, we can see a coordinated, systematic approach to building a geographic fortress.