Geography Quiz

Map data attributions

The geography in this platform is derived from the datasets below. Each has been modified — filtered to the countries in use, simplified for drawing, and in places corrected — and those changes are listed so nothing here is mistaken for the original.

Natural Earth

Made with Natural Earth.

Licence: Public domain. All versions of Natural Earth raster + vector map data are in the public domain, and its authors invite use for personal, educational, and commercial purposes.

Changes made

  • Filtered to Japan.
  • Simplified to 30% of vertices using Visvalingam-Whyatt.
  • Prefectures dissolved by region to derive the nine regions.
  • Region assignment corrected for Saga and Nagasaki, which are null in the source; both are Kyushu.
  • Coordinates rounded to four decimal places.

National Land Numerical Information (administrative boundaries), Japan

Source: National Land Information Division, Ministry of Land, Infrastructure, Transport and Tourism of Japan (https://nlftp.mlit.go.jp/ksj/). Adapted.

Licence: Compatible with CC BY 4.0. The National Land Numerical Information terms of use permit free use including commercial use, reproduction, and adaptation, and are stated to be compatible with Creative Commons Attribution 4.0 International. Attribution is required, and adaptations must be marked as such.

Changes made

  • Filtered to the 23 special wards of Tokyo (JIS codes 13101–13123).
  • Dissolved by ward code, since the source splits each ward into several polygons.
  • Simplified and coordinates rounded to five decimal places.

Distritos municipales de Madrid, Ayuntamiento de Madrid

Origen de los datos: Ayuntamiento de Madrid. Distritos municipales, last updated 18 September 2026. Adapted. The Ayuntamiento de Madrid does not endorse this application.

Licence: Condiciones generales de reutilización del Ayuntamiento de Madrid. The city's general terms for re-use of its documents, made under Spain's Ley 37/2007 on the re-use of public sector information. They permit re-use “para fines comerciales y no comerciales” and grant a free, non-exclusive right of “reproducción, distribución, comunicación pública o transformación” worldwide. Not share-alike. The obligations are to cite the source, to state the date the data was last updated, not to distort the meaning of the information, and not to suggest that the city endorses the re-use.

Changes made

  • Converted from TopoJSON to GeoJSON.
  • District names normalised to close the spaces around their hyphens: the source writes “Moncloa - Aravaca” and the city writes “Moncloa-Aravaca”.
  • Simplified and coordinates rounded to five decimal places.

Unitats administratives de la ciutat de Barcelona, Ajuntament de Barcelona

© Ajuntament de Barcelona, CC BY 4.0.

Licence: CC BY 4.0. Creative Commons Attribution 4.0 International, as declared by the portal. It permits sharing and adaptation for any purpose, including commercially, on the single condition of attribution, and adds no share-alike term.

Changes made

  • Filtered to the ten districts and read from the WGS84 geometry rather than the ETRS89 one.
  • Converted from WKT to GeoJSON.
  • Simplified and coordinates rounded to five decimal places.

OurAirports

Airport data from OurAirports, maintained by David Megginson.

Licence: Public domain. All data is released to the Public Domain, and comes with no guarantee of accuracy or fitness for use. Credit is welcomed but explicitly not required: "We'd love you to give us credit...but you're not required to."

Changes made

  • Filtered to Spain (`iso_country` ES) and to airports with an IATA code and scheduled service, which excludes the four air bases, the closed Ciudad Real airport, and Ceuta's heliport.
  • Split into two tiers by the source's own `type`: the 21 it classes `large_airport`, and all 44 with scheduled service.
  • For Europe, one airport chosen per capital city from a table rather than by a rule, because the source carries no traffic figures and so cannot say which airport of a city is the principal one. Each code is checked against the source for a unique match in the right country within 120 km of the capital.
  • Coordinates rounded to four decimal places.

Flags of Spain's autonomous communities

Castile and León: Rastrojo, CC BY 3.0, via Wikimedia Commons. La Rioja: jynus, CC BY 2.5, via Wikimedia Commons.

Licence: Mixed: public domain, CC0, CC BY, MIT, and one original drawing. Twenty flags with twenty provenances, listed per file in assets/region-flags/manifest.ts: Spain's seventeen autonomous communities and three of the four nations of the United Kingdom. Eight are public domain and three CC0, which need nothing. Six come from flag-icons under MIT — the three British ones and three Spanish. Two are CC BY and their credits are below, which is what that licence asks for. None is share-alike: this project does not ship CC BY-SA, and every Commons rendering of Andalucía's flag is CC BY-SA, so that one was drawn for the project instead — a flag's design is official insignia rather than the copyrightable part, so an original drawing of it carries no one else's licence.

Changes made

  • Andalucía and Cantabria are the arms-less civil forms; the versions carrying a coat of arms are CC BY-SA.
  • Copied into public/flags/regions by `pnpm flags`, from the committed sources in assets/region-flags.

Wikidata

Coordinates from Wikidata contributors.

Licence: CC0 1.0 Universal (public domain dedication). CC0 waives copyright, so no attribution is legally required. It is recorded because every other source here is, and because the provenance of a coordinate matters more than its licence.

Changes made

  • Only the capes named in data/build/spain-capes.ts were taken, chosen by hand rather than by query.
  • Wikidata's own typing could not be used as the filter: P31 = cape admits inland hills from a batch import and excludes Cabo de Palos, which is typed as a village.
  • Coordinates rounded to four decimals, about 11 m.

US Census Bureau, Census Regions and Divisions of the United States

Region and division membership from the United States Census Bureau.

Licence: Public domain (work of the United States federal government). A work prepared by an officer or employee of the United States government as part of their official duties is not subject to copyright in the United States. No attribution is legally required; it is recorded because the scheme is a published convention rather than a fact of geography, and a pupil asked where the Midwest is deserves to know whose Midwest.

Changes made

  • Only the membership was taken — which states are in which division. The geometry is Natural Earth's, dissolved from the published us-states document.
  • The District of Columbia, a member of the South Atlantic division, is absent because us-states excludes it: it is not a state, and at 177 km² it projects to 3 canvas units.
  • Not taken from Wikipedia, whose text is CC BY-SA and which this project does not use.

flag-icons

Flags from flag-icons, copyright (c) 2013 Panayiotis Lipiridis. MIT licence.

Licence: MIT. MIT permits use, copying, modification and distribution, including commercially, provided the copyright notice and permission notice are included in all copies or substantial portions of the software.

Changes made

  • Only the 4x3 flags for the 195 countries in the place tree are included; the other 76 in the set are not.
  • Copied into public/flags by `pnpm flags`, with the MIT licence text alongside them, rather than imported through the package's stylesheet.