Economic, Geographic & Travel Data Sources and Methodology
All economic, demographic, electrical, and aviation distance figures are compiled from official international standards and spherical geometry.
• Macroeconomics & Demographics: IMF World Economic Outlook (WEO), World Bank Open Data, and UN Population Division.
• Voltage, Frequency & Plug Types: International Electrotechnical Commission (IEC World Plugs, Types A–N).
• Passport Power & Visa Notes: Ministry of Foreign Affairs travel advisories and Henley Passport Index (always verify official embassy notices before departure).