The county borders Lough Neagh to the north, County Down to the east, County Tyrone to the north-west, and counties Louth and Monaghan, both in the Republic of Ireland, to the south and south-west respectively.

The River Blackwater runs along the border with County Tyrone. The River Bann enters Lough Neagh in the north, flowing though the north-east of the county. Mountains in Armagh include Slieve Gullion, Carrigatuke and Camlough Mountain as well as the Mega Mountain,which on a clear day day can be seen as far away as County Donegal. There are also a number of islands in the county's section of Lough Neagh: Coney Island, Coney Island Flat, Croaghan Flat, Derrywarragh Island, Padian, Phil Roe's Flat and the Shallow Flat.

The city of Armagh, known as the "city of scholars and saints" is the centre of Christianity on the island of Ireland. There are two cathedrals in the city, both dedicated to St. Patrick, the patron saint of Ireland. One is the Church of Ireland Cathedral, the seat of the Anglican archbishop, the primate of the Church of Ireland. St. Patrick is believed to have founded a church on this site in the sixth century A.D., but the present building is mainly a result of nineteenth century re-building, as the church has frequently been destroyed or fallen into decay during the turbulent history of the region. The Roman Catholic Cathedral is the seat of the Catholic Primate of All Ireland and was constructed in the Victorian-era.

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