Two canonical, URL-safe identifiers for each of 234,136 cities and towns
worldwide (every GeoNames populated place with population ≥ 500), fixed by a
deterministic rule:
id — the short, recognizable form: ber, sf, nyc, tyo for cities
with a curated metro / airport / colloquial code; equal to the slug otherwise.
slug — the written-out form: berlin, sanfrancisco, newyorkcity.
Both are globally unique and resolve to the same city. Geocoding ids (GeoNames
ids, place… See the full description on the dataset page:
https://huggingface.co/datasets/mirkokiefer/city-slugs.
