The A50 is a road in counties Armagh

County Armagh

-History:Ancient Armagh was the territory of the Ulaid before the fourth century AD. It was ruled by the Red Branch, whose capital was Emain Macha near Armagh. The site, and subsequently the city, were named after the goddess Macha...

 and Down

County Down

-Cities:*Belfast *Newry -Large towns:*Dundonald*Newtownards*Bangor-Medium towns:...

 in Northern Ireland

Northern Ireland

Northern Ireland is one of the four countries of the United Kingdom. Situated in the north-east of the island of Ireland, it shares a border with the Republic of Ireland to the south and west...

. It starts in the town of Portadown

Portadown

Portadown is a town in County Armagh, Northern Ireland. The town sits on the River Bann in the north of the county, about 23 miles south-west of Belfast...

 and continues through Gilford

Gilford

Gilford is a village in County Down, Northern Ireland. The village sits on the River Bann between the towns of Banbridge, Tandragee and Portadown. It covers the townlands of Loughans, Ballymacanallen and Drumaran. It had a population of 1,573 people in the 2001 Census...

, Lawrencetown

Lawrencetown, County Down

Lawrencetown or Laurencetown is a small village in County Down, Northern Ireland. It sits on the River Bann, along the main road between the towns of Banbridge and Portadown. It is within the parish of Tullylish and covers the townlands of Knocknagore and Drumnascamph. In the 2001 Census it had a...

, Banbridge

Banbridge

Banbridge is a town in County Down, Northern Ireland. It lies on the River Bann and the A1 road. It was named after a bridge built over the Bann in 1712. The town grew as a coaching stop on the road from Belfast to Dublin and thrived from Irish linen manufacturing...

, Katebridge, Moneyslane

Moneyslane

Moneyslane is a small village and townland in County Down, Northern Ireland, on the main route from Castlewellan to Banbridge. In the 2001 Census it had a population of 147. It lies within the District of Banbridge.-History:...

, Ballyward and Castlewellan

Castlewellan

Castlewellan is a village in County Down, Northern Ireland. It is beside Castlewellan Lake and Slievenaslat mountain, southwest of Downpatrick. It lies between the Mourne Mountains and Slieve Croob. It had a population of 2,392 people in the 2001 Census....

, before arriving in the seaside town of Newcastle on the Irish Sea

Irish Sea

The Irish Sea separates the islands of Ireland and Great Britain. It is connected to the Celtic Sea in the south by St George's Channel, and to the Atlantic Ocean in the north by the North Channel. Anglesey is the largest island within the Irish Sea, followed by the Isle of Man...

, located at the foot of Slieve Donard

Slieve Donard

Slieve Donard is a 850 m mountain in County Down, Northern Ireland. It is part of the Mourne Mountains and the highest peak in Northern Ireland and in the wider province of Ulster. It is the 19th highest peak on the island of Ireland...

.

The road has a graded junction with the main Dublin-Belfast

Belfast

Belfast is the capital of and largest city in Northern Ireland. By population, it is the 14th biggest city in the United Kingdom and second biggest on the island of Ireland . It is the seat of the devolved government and legislative Northern Ireland Assembly...

 A1

A1 road (Northern Ireland)

The A1 is a major route in Northern Ireland. It runs from Belfast via Lisburn and Banbridge to the border with the Republic of Ireland south of Newry, from where the road continues to Dublin, becoming the N1 road and M1 motorway...

 dual carriageway to the southeast of Banbridge. The section between Portadown and Katesbridge vaguely follows the course of the River Bann

River Bann

The River Bann is the longest river in Northern Ireland, the total length being 80 miles . The river winds its way from the south east corner of Northern Ireland to the north west coast, pausing in the middle to widen into the enormous Lough Neagh...

 from its source in the Mourne Mountains, against the current.