Artificial islands and maritime power: The case of the South China Sea

In a World where borders are no longer fixed by nature, China’s artificial islands are reshaping maritime power, redrawing the map of Asia, and challenging the foundations of international law.

Photo by FrankRamspott in iStock

In the classical geopolitics of the 20th century, the great powers competed over territory, natural resources, and spheres of influence. But in today’s increasingly fluid global order, a new strategy is emerging — one not based in invasion or formal annexation, but on strategic construction. Few regions illustrate this transformation more clearly than the South China Sea, where China’s artificial islands have turned contested waters into concrete assertions of power.

The South China Sea is more than a strategic passage — it is a critical artery of global trade, with nearly one-third of all maritime commerce flowing through it. Beneath its surface lie rich reserves of oil and natural gas, and above it soar the military ambitions of regional and global actors. Multiple countries — including Vietnam, the Philippines, Malaysia, Brunei, and Taiwan — claim overlapping zones in this maritime space. But it is China that has fundamentally altered the status by creating where there was none.

Since 2013, Beijing has engaged in extensive land reclamation operations, transforming submerged reefs into militarized islands. Equipped with airstrips, radar systems, missile defenses, and deep-water ports, these installations serve as permanent platforms for projection of power. They are not mere symbols — they are operational outposts designed to extend surveillance, enforce claims, and deny access to others. Strategically located across the Spratly and Paracel islands, these structures allow China to monitor and potentially control one of the world’s most vital maritime corridors.

Beijing justifies its presence with the so-called Nine-Dash line, a sweeping historical claim that encompasses almost 90% of the South China Sea. In 2016 the Permanent Court of Arbitration in The Hague ruled that this claim had no legal basis under the United Nations Convention on the Law of the Sea (UNCLOS). China, however, rejected the ruling, continuing to build and reinforce its island network — effectively creating ‘’facts on the water’’ that challenge not only international law but also regional balance.

Photo by FrankRamspott in iStock

What makes this strategy so powerful is its subtlety. Unlike a military invasion, the construction of islands avoids triggering traditional thresholds of armed conflict. Yet it achieves similar goals: control, deterrence, and permanent presence. In the language of strategic studies, these islands function as unsinkable aircraft carries — fixed, fortified, and deeply embedded in contested space. Through them, China shifts the tactical and legal landscape without firing a shot.

The response from the United States and its allies has been both cautious and deliberate. Washington conducts regular Freedom of Navigation Operations (FONOPs), sailing naval vessels close to Chinese-built features to challenge their legality and assert the principle of open seas. Meanwhile, regional players like Japan, Australia and India are investing in naval modernization and forging new alliances, seeking to preserve a free and open Indo-Pacific.

But beneath the surface of military maneuvers lies a deeper question: what constitutes sovereignty in the 21st century? Can a state claim dominion not just over land, but over space it has manufactured? If physical construction becomes a pathway to political control, what limits remain in a rules-based international system?

Artificial islands also raise long-term precedents. If China’s strategy succeeds, other nations may adopt similar tactics — not only in Asia, but in the Arctic, the Eastern Mediterranean, and beyond. In a world of rising sea levels and rapid climate change, the ability to fabricate strategic territory may become an increasingly valuable geopolitical tool. And yet, it also risks undermining decades of legal and diplomatic frameworks built to prevent unilateral expansion.

This is not just about reefs and runways. It is about the future shape of global order — who defines borders, who enforces rules, and how power is exercised is spaces that defy simple cartographic boundaries. The South China Sea may appear remote to many observers, but it offers a blueprint for a new kind of competition: one where construction becomes coercion, and where geopolitical architecture replaces conventional force.

In this emerging maritime era, the map is no longer fixed. It can be drawn, dredged, and poured in concrete. And as artificial islands rise from contested waters, so too rises a new form of strategic influence — built not on historical claims, but on what a nation dares to construct.