Antrim: Irish for "The One Ridge" — County and Town

Antrim (Irish: Aontroim, from Áin treabh / Áit treabh — "the one ridge" or "solitary dwelling") refers to two entities in Northern Ireland:

County Antrim

One of six historic counties (now ceremonial; local government uses 11 districts). Area: 3,046 km² (1,176 sq mi). Population: ~618,000 (2021). Key places: Belfast (mostly in Antrim), Lisburn, Newtownabbey, Carrickfergus, Larne, Ballymena, Antrim town, Giant's Causeway (UNESCO), Glens of Antrim, Lough Neagh (UK's largest lake, borders 5 counties).

Antrim Town

Small town (~23,000) on Six Mile Water river, north shore of Lough Neagh. Antrim Castle Gardens (17th-century), Old Courthouse, Shane's Castle ruins. Junction for M2 (Belfast), M22 (Derry), A26 (Ballymena).

Name Nuance

Aontroim likely describes a prominent ridge near Lough Neagh—geography naming the settlement, then the county. Not "lone house" (that's aon tigh).

Antrim: ridge, river, lough, history, gateway to the North Coast.