Armagh
Armagh ( ; ga, Ard Mhacha, , "Macha's height") is the county town of County Armagh and a city in Northern Ireland, as well as a civil parish. It is the ecclesiastical capital of Ireland – the seat of the Archbishops of Armagh, the Pri ...
Northern Ireland
Northern Ireland ( ga, Tuaisceart Éireann ; sco, label= Ulster-Scots, Norlin Airlann) is a part of the United Kingdom, situated in the north-east of the island of Ireland, that is variously described as a country, province or region. Nort ...
. It starts in the town of
Portadown
Portadown () is a town in County Armagh, Northern Ireland. The town sits on the River Bann in the north of the county, about southwest of Belfast. It is in the Armagh City, Banbridge and Craigavon Borough Council area and had a population of a ...
Banbridge
Banbridge ( , ) is a town in County Down, Northern Ireland. It lies on the River Bann and the A1 road (Northern Ireland), A1 road and is named after a bridge built over the River Bann in 1712. It is situated in the Civil parishes in Ireland, c ...
Castlewellan
Castlewellan () is a small town in County Down, in the south-east of Northern Ireland close to the Irish Sea. It is beside Castlewellan Lake and Slievenaslat mountain, southwest of Downpatrick. It lies between the Mourne Mountains and Slieve C ...
, before arriving in the seaside town of Newcastle on the
Irish Sea
The Irish Sea or , gv, Y Keayn Yernagh, sco, Erse Sie, gd, Muir Èireann , Ulster-Scots: ''Airish Sea'', cy, Môr Iwerddon . is an extensive body of water that separates the islands of Ireland and Great Britain. It is linked to the Ce ...
, located at the foot of
Slieve Donard
Slieve Donard ( ; ) is the highest mountain in Northern Ireland and the wider province of Ulster, with a height of . The highest of the Mourne Mountains, it is near the town of Newcastle on the eastern coast of County Down, overlooking the Iris ...
.
The road has a graded junction with the main
Dublin
Dublin (; , or ) is the capital and largest city of Republic of Ireland, Ireland. On a bay at the mouth of the River Liffey, it is in the Provinces of Ireland, province of Leinster, bordered on the south by the Dublin Mountains, a part of th ...
-
Belfast
Belfast ( , ; from ga, Béal Feirste , meaning 'mouth of the sand-bank ford') is the capital and largest city of Northern Ireland, standing on the banks of the River Lagan on the east coast. It is the 12th-largest city in the United Kingdo ...
A1 dual carriageway to the southeast of Banbridge. The section between Portadown and Katesbridge vaguely follows the course of the
River Bann
The River Bann (from ga, An Bhanna, meaning "the goddess"; Ulster-Scots: ''Bann Wattèr'') is one of the longest rivers in Northern Ireland, its length, Upper and Lower Bann combined, being 129 km (80 mi). However, the total lengt ...
from its source in the
Mourne Mountains
The Mourne Mountains ( ; ga, Beanna Boirche), also called the Mournes or Mountains of Mourne, are a granite mountain range in County Down in the south-east of Northern Ireland. They include the highest mountains in Northern Ireland, the high ...