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The Narrows PRI scores every major port in the World Port Index across four dimensions: physical accessibility, operational reliability, trade concentration, and geopolitical stability. Enter your email for immediate access. No password, no waiting.
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3778 ports scored.
Four dimensions of risk.
The Narrows PRI scores every major port in the World Port Index across four dimensions: physical accessibility, operational reliability, trade concentration, and geopolitical stability. Each scored from independent source data, combined via geometric mean. Lower score is lower risk.
| Rank↕ | Port↕ | Country↕ | PRI↓ | D1↕ | D2↕ | D3↕ | D4↕ |
|---|
Geometric mean composite scoring
Each dimension is scored 0–10 from independent source data, then combined via geometric mean (floor 0.1 per component) to produce the composite PRI. The geometric mean penalises extreme scores in any single dimension. A port that scores very poorly on stability cannot be rescued by good physical access.
The effective empirical maximum in the World Port Index universe is 3.645, not 10. Most ports have reasonable physical infrastructure, which structurally moderates D1. Score distribution is right-skewed; the vast majority of ports fall below 2.0.
Full methodology documentationD1: Accessibility
Controlling depth, vessel class coverage, terminal count, cyclone exposure, seismic hazard. Source: World Port Index, IBTrACS, USGS.
D2: Reliability
Dwell time, labour regime stability, port state control record. Source: World Bank CPPI/PPPI, ILO, Paris/Tokyo MOU.
D3: Concentration
Catchment share, hinterland count, Herfindahl-Hirschman index, alternative port distance. Source: UN Comtrade, WPI.
D4: Stability
WGI governance score (PS and GE merged), sanctions exposure, active territorial dispute. Source: World Bank WGI, OFAC, ICJ.