Sources and methodology

Natural Earth

National boundaries and river centre lines come from Natural Earth 1:50m, public domain. Geometry is generalized and is not suitable for navigation or legal decisions.

Wikidata

QIDs, classes, labels, countries, coordinates and elevations come from Wikidata (CC0). Updates use small queries followed by batch validation.

Method

Only validated entities are published. Every river requires an explicit Natural Earth match; all segments are grouped and no line is inferred.

No validated desert polygons exist in the available package: a representative Wikidata point is shown, not the full boundary.

Length comes from the structured Wikidata value; it is not calculated from simplified Natural Earth geometry.

Rankings are calculated only among entities included in MetaphAI with comparable data.

Related items prioritize the same category, shared countries and shared continents.

2026-09-19 · CC0 1.0 / Public domain.