World outlines: Natural Earth, via world-atlas. Geographic rendering: D3.
Administrative boundaries: geoBoundaries, release 9469f09. China prefectures: cn-atlas (upstream: ruiduobao/shengshixian, 2023). Boundaries are simplified, selected, combined and encoded for this map; Tokyo combines special wards, and island outlines are extracted from municipal geometries. These are illustrative administrative areas, not precise travel tracks or terrain.
Japanese boundary derivatives retain the source attribution and share-alike terms listed below. City coordinates: cities.json, with selected place references from the Geospatial Information Authority of Japan, GeoNames/Mapcarta, Yandex Maps and Armenian Hidden Gems.
| Dataset | Attribution | License | Reference |
|---|---|---|---|
| ARM ADM2 | Government of Armenia, OCHA ROCCA | Creative Commons Attribution 3.0 Intergovernmental Organisations (CC BY 3.0 IGO) | License source |
| CHN ADM2 | National Administration of Surveying, Mapping and Geoinformation of China, Revolutionary GIS | Open Data Commons Public Domain Dedication and License (PDDL) v1.0 | License source |
| FRA ADM2 | Institut national de l'information géographique et forestière (IGN-F) | Etalab Open License 2.0 | License source |
| GEO ADM2 | geoBoundaries, Wikimedia Commons | Public Domain | License source |
| ISL ADM2 | National Land Survey of Iceland | Creative Commons Attribution 4.0 International (CC BY 4.0) | License source |
| ITA ADM4 | ISTAT, National Institute of Statistics | Creative Commons Attribution 3.0 License | License source |
| ITA ADM2 | ISTAT, National Institute of Statistics | Creative Commons Attribution 3.0 License | License source |
| JPN ADM2 | OpenStreetMap, Wambacher | Creative Commons Attribution-ShareAlike 2.0 | License source |
| THA ADM2 | Royal Thai Survey Department, OCHA ROAP | Creative Commons Attribution 3.0 Intergovernmental Organisations (CC BY 3.0 IGO) | License source |