The A21, also Comber road, is a road in

County Down County Down () is one of the six counties of Northern Ireland, one of the nine counties of Ulster and one of the traditional thirty-two counties of Ireland. It covers an area of and has a population of 531,665. It borders County Antrim to the ...

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 ...

. The route commences in Bangor, passing through

Newtownards Newtownards is a town in County Down, Northern Ireland. It lies at the most northern tip of Strangford Lough, 10 miles (16 km) east of Belfast, on the Ards Peninsula. It is in the Civil parishes in Ireland, civil parish of Newtownard ...

Comber Comber ( , , locally ) is a town in County Down, Northern Ireland. It lies south of Newtownards, at the northern end of Strangford Lough. It is situated in the townland of Town Parks, the civil parish of Comber and the historic barony of Cast ...

, and

Ballygowan Ballygowan () is a village in County Down, Northern Ireland. It is within the Ards and North Down Borough. The town of Comber is a short distance to the north-east, the town of Saintfield to the south, and the city of Belfast further to the no ...

, and finishes on the northern outskirts of

Ballynahinch Ballynahinch may refer to: Northern Ireland * Ballynahinch, County Armagh, a townland *Ballynahinch, County Down, a town Republic of Ireland *Ballynahinch (barony), in County Galway *Ballynahinch, County Galway, a townland in County Galway * Bally ...

. There are two dual carriageway sections; between Bangor and Newtownards, and between Newtownards and Comber. The second of these passes through farmland near the northern shores of

Strangford Lough Strangford Lough (from Old Norse ''Strangr Fjörðr'', meaning "strong sea-inlet"PlaceNames N ...

. This section also passes within 2 miles of

Scrabo Tower Scrabo Tower is a high 19th-century lookout tower or folly that stands on Scrabo Hill near Newtownards in County Down, Northern Ireland. It provides wide views and is a landmark that can be seen from afar. It was built as a memorial to Charle ...

References

Roads in County Down 2-0021 {{Down-geo-stub