Cartographia Imperialis is an unofficial, fan-made interactive atlas for exploring the Warhammer 40,000 galaxy. Presented as an Imperial cartographic archive, it brings together 99 charted locations across the setting and offers a visual reference for worlds, regions, factions, and major events. Visitors can switch between the M41 Pre-Rift and M42 Indomitus eras, view the Great Rift overlay, explore routes, and adjust map layers and labels.

A search and filter interface helps users browse records by segmentum and classification, including categories such as Forge Worlds, Chapter Worlds, hive planets, war zones, and xenos territories. Selecting a location opens a lore dossier, while the archive index provides an overview of the available records. The project also includes field guides and notes that charted positions are approximate.

Designed as a reference and exploration experience for fans, Cartographia Imperialis is not affiliated with or endorsed by Games Workshop. Its interactive map and organized lore records make the vast fictional galaxy easier to navigate