Ulster

Sources

• github.com · checked Oct 12, 2026 geoBoundaries (Runfola et al.) gbOpen IRL ADM1 (simplified GeoJSON; boundary year 2022, build Dec 12, 2023; underlying source: Ordce Survey Ireland, licence: Creative Commons Attribution 4.0 (CC BY 4.0); gbOpen CC BY 4.0), read 2026-10-12: name and outline of this first-level division. Code: ISO 3166-2 IE-U from Debian iso-codes (salsa.debian.org/iso-codes-team/iso-codes, data/iso_3166-2.json), matched by name, cross-checked with Natural Earth 10m admin-1 (public domain). For: Ulster (name, type and address code)
• irishstatutebook.ie · checked Oct 12, 2026 Bunreacht na hÉireann (Irish text) and oireachtas.ie / logainm.ie: Irish-language names of the State, provinces, institutions and offices. For: Ulster in Irish
• github.com · checked Oct 12, 2026 geoBoundaries (Runfola et al.) gbOpen IRL ADM1 simplified GeoJSON (boundary year 2022, build Dec 12, 2023; source Ordce Survey Ireland; gbOpen CC BY 4.0), read 2026-10-12: outline, made valid with ST_MakeValid; flags de_jure=t de_facto=t. For: Ulster boundary