STRATEGIC GEOMETRY

South China Sea Iron Triangle Map

Apex Positions
Scarborough Shoal (15.15°N, 117.77°E)
Paracel Islands (16.83°N, 112.33°E)
Spratly Islands (9.50°N, 112.80°E)
SLOC Route: Malacca Strait → Taiwan Strait / Bashi Channel
Iron Triangle Area
385,000 km²
Dynamic spatial envelope
Radar Coverage (SLOC & Nine-Dash)
61.4%
Status Quo Coverage Gap
Bashi / Luzon Interception Gap
210 km
Unmonitored corridor width
US-PH MDT Trigger Threshold
Low / Skirmish
Status Quo Monitoring

Geopolitical & Spatial Analysis

Scarborough Shoal represents the missing eastern apex of China's "iron triangle" in the South China Sea. Currently unfortified, a surveillance radar or military outpost at Scarborough Shoal closes the eastern surveillance gap, extending radar overlap directly over Manila and the Bashi Channel, while elevating the escalation tier under the US-Philippines Mutual Defense Treaty.

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