Credits

Skerved Geo (geo.skerved.se) is a free practice tool by Vincent Skerved. Built with help from AI coding tools; curated and maintained by a human. Feedback: skerved@gmail.com.

App code is MIT-licensed. Third-party maps and media keep their own terms. This page lists everything redistributed in the live site.

Natural Earth

World countries, capitals/cities points, peaks, lakes, rivers, admin-1 lines, US states, and the Russia outline are derived from Natural Earth (public domain), and shipped here as local SVG maps and quiz data. World - Peaks uses NE elevation points (50m/10m). World - Deserts uses NE geography-region desert/basin polygons (plus Mojave from OSM). World - Seas & bays uses NE marine polygons (50m/10m). World - Rivers and World - Lakes quiz maps use NE 50m river centerlines and lakes, plus NE marine/10m layers for Caspian Sea, Lago di Garda, and Crater Lake.

Flags

Country and US state flag SVGs from flagcdn.com / Flagpedia (Wikimedia Commons-based vectors), included in this site. Individual flags may carry their own Commons license terms.

Sweden - landskap

Province boundaries: perliedman/svenska-landskap (CC0).
Coats of arms (vapen): Wikimedia Commons SVGs (per-file licenses; Swedish heraldic rules may still limit how arms are used).
Provincial animals and flowers: concept lists from WWF Sverige and Wikipedia (province flowers). Photos come from Wikimedia Commons (searched by species); thanks to the Commons contributors who shared them.

Sweden - kommuner

Municipality polygons: okfse/sweden-geojson (reuse offered by that project; upstream Swedish open data).
Population figures in item text: Statistics Sweden (SCB) via their open data APIs.
Lakes on the map: Natural Earth (above).

Brazil

State and region practice maps are SVG derived from IBGE-style state boundaries (GeoJSON in this project carries codigo_ibg and Carto-style export fields from a 2015 open dump).
Phone-code (DDD) practice maps are SVG from a 67-area DDD polygon set kept with this project; the original publisher of that polygon file is still being traced.

US area codes (phone codes)

Geographical NPA polygons from Esri’s USA Telephone Area Codes layer (FeatureServer), simplified into local practice SVGs.
City labels joined from ravisorg/Area-Code-Geolocation-Database when available.

Germany - Kreise

Kreis and Bundesland outlines from m-ad/geofeatures-ags-germany (GeoJSON derived from AliceWi/TopoJSON-Germany / GADM lineage), used as local practice SVGs. AGS ids identify Kreise.

Turkey - Belediyeler

Province (il) and district (ilçe) boundaries from geoBoundaries gbOpen Türkiye ADM1/ADM2 (OSM-derived; ODbL 1.0 / © OpenStreetMap contributors), used as local practice SVGs.

World - Rivers & Lakes (OSM extras)

Lake Maracaibo and Lake Ohrid polygons from OpenStreetMap (© OpenStreetMap contributors, ODbL 1.0), via Nominatim, merged into practice SVGs. See materials/world-hydro/ATTRIBUTION.md.

World - Peaks (OSM extras)

A few peaks missing from Natural Earth elevation points (Kangchenjunga, Annapurna, Table Mountain, Mount Cameroon, Vesuvius, Cotopaxi, Popocatépetl) use coordinates from OpenStreetMap (© OpenStreetMap contributors, ODbL 1.0), via Nominatim. See materials/world-peaks/ATTRIBUTION.md.

World - Deserts (OSM extras)

Mojave Desert polygon from OpenStreetMap (© OpenStreetMap contributors, ODbL 1.0), via Nominatim (absent from Natural Earth desert layer). See materials/world-deserts/ATTRIBUTION.md.

World - Seas & bays (OSM extras)

Guanabara Bay polygon from OpenStreetMap (© OpenStreetMap contributors, ODbL 1.0), via Nominatim (absent from Natural Earth marine layer). See materials/world-seas-bays/ATTRIBUTION.md.

Japan phone codes

Municipality boundaries from smartnews-smri/japan-topography (simplified), derived from MLIT National Land Numerical Information administrative zones (N03, CC BY 4.0). Dissolved into approximate landline trunk-prefix regions for practice SVGs.

Philippines

Region and province boundaries: faeldon/philippines-json-maps by James Faeldon (MIT).
Province study list adapted from a Learnable Meta map (author όλδօ).
Motorcycle plate strip images from plonkit.net / Philippines guide (template licenceplates.png), used with Plonk It’s stated condition that guide resources may be reused when Plonk It is explicitly credited. Colour-strip rules also follow Philippine motorcycle plate regulations (RA 11235 IRR).

Indonesia

Province / kabupaten geometry: mashadinoor/Indonesia-Geojson-2026 (MIT; BIG-derived data - see that repo).
Regency codes/names: edwardsamuel/Wilayah-Administratif-Indonesia (BPS-style CSV).

Russia - city and town names

Place list and transliteration aids from a Learnable Meta map by Vincent Skerved. Outline map from Natural Earth.

Other

Short city/capital “fact” lines are original study notes written for this project.
Free geography practice tool. Open data and media above are used as credited on this page.

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