BEIJING, July 20 — Approximately $3.4 trillion in annual trade moves through the South China Sea, according to the Center for Strategic and International Studies, making the waterway one of the world’s most concentrated arteries of commerce. The corridor handles roughly one-third of global maritime trade, including 40% of liquefied natural gas and 30% of crude oil shipments. For China, the sea is vital for energy imports; for the Philippines, it underpins domestic fuel supplies and broader trade flows.
The region’s two critical chokepoints are the Strait of Malacca and the South China Sea itself. A prolonged blockade or conflict in either location would drive up shipping costs, according to CSIS, and raise insurance premiums for vessels transiting the area.
In 2023, after a water cannon incident involving Chinese and Philippine vessels, some shipping firms began evaluating alternative routes, but none proved economically viable, the think tank noted. The sheer scale of cargo — LNG tankers, crude carriers, and container ships — makes diversion expensive and logistically difficult. Beyond energy, the South China Sea provides about 12% of the global fish catch, worth billions of dollars annually.
That resource base adds another layer of economic interdependence and potential friction among the littoral states.
Rising Risks and Insurance Costs
Any escalation in the region would not only affect shipping but also hit tourism and investment across Southeast Asia, CSIS warned. Insurance premiums for transiting vessels would likely jump, increasing the cost of goods delivered through these routes. The 2016 arbitration ruling granted the Philippines exclusive rights to resources within its 200-nautical-mile exclusive economic zone, but China has prevented Philippine exploitation of resources near disputed features, according to the same analysis. That unresolved tension keeps the threat of disruption alive for shippers and insurers.
Regional Dependencies and Geopolitical Tensions
For China, the South China Sea is essential for energy imports; for the Philippines, it is critical for domestic fuel and trade, the CSIS report stated. The region’s dependence on this single corridor means that even a localized incident could reverberate through global supply chains. The 2023 water cannon incident demonstrated how quickly friction at sea can prompt commercial reassessments, though no alternative route has yet emerged as a realistic substitute. The Strait of Malacca, the narrow passage between the Malay Peninsula and Indonesia, funnels a significant portion of the traffic headed to East Asian economies, and any closure
