Map data
The countries and local regions on the map and the boards come from Overture Maps, divisions theme, release 2026-09-23.1: 242 countries and 385,888 local regions. Overture draws on these sources:
- OpenStreetMap — © OpenStreetMap contributors, available under the Open Database License (ODbL) 1.0. Most of the boundaries.
- geoBoundaries — geoboundaries.org, CC BY 4.0.
- Toitū Te Whenua Land Information New Zealand (LINZ) — sourced from the LINZ Data Service, CC BY 4.0.
- Esri Community Maps contributors — communitymaps.arcgis.com, CC BY 4.0. Names in other languages.
The time zone a moment is posted in, which decides the calendar day its streak counts on, comes from timezone-boundary-builder, made from OpenStreetMap data — © OpenStreetMap contributors, ODbL 1.0 — used through the timezonefinder library. It is only read, never shown or passed on.
What we changed
Below every country we keep one level of local regions, as fine as the data allows: starting from the country, an area is replaced by its subdivisions of one kind wherever they cover it, down to municipalities and their complete subdivisions. Land no local region covers — a lake, a forest, land no municipality claims — is joined to the neighbouring region it shares the longest border with, so the local level covers every country without holes. Boundaries are simplified to about 30 metres and coordinates rounded to about 11 metres; all names are in English, transliterated where the data has no English name.
The derived data
Our derived database is available under the ODbL 1.0, like the OpenStreetMap data it is made from. The method that recreates it, exactly, from the Overture release: build.py (plain text).