District boundary database: © OpenStreetMap contributors, via geoBoundaries.
Source: https://www.geoboundaries.org/api/current/gbOpen/TUR/ADM2/
Geometry snapshot: wmgeolab/geoBoundaries commit 9469f09, TUR ADM2 simplified.
Source represents 2021 boundaries; downloaded 2026-09-10.
License: Open Database License (ODbL) 1.0.
https://opendatacommons.org/licenses/odbl/1-0/
https://www.openstreetmap.org/copyright
This adapted database is offered under the same ODbL 1.0 license.
Changes: coordinate projection, topology-preserving simplification, parent
province assignment by greatest overlap against geoBoundaries TUR ADM1, normalized identifiers, label points.
Rebuild script: scripts/geo/build-district-atlas.py.
Individual province JSON files in this directory comprise the adapted database.

Parent boundaries: https://github.com/wmgeolab/geoBoundaries/raw/9469f09/releaseData/gbOpen/TUR/ADM1/geoBoundaries-TUR-ADM1.geojson
Parent boundary license: Creative Commons Attribution-ShareAlike 2.0