Derry, officially Londonderry, is the largest city in County Londonderry, the second-largest in Northern Ireland and the fifth-largest on the island of Ireland. The old walled city lies on the west bank of the River Foyle, which is spanned by two road bridges and one footbridge. The city now covers both banks.
Road sign in Northern Ireland with the reference to London obscured
Road signs in the Republic of Ireland use Derry and the Irish Doire.
Unionist graffiti c. 1920 showing the short version of the name.
The Republic of Ireland–United Kingdom border, sometimes referred to as the Irish border or British–Irish border, runs for 499 km (310 mi) from Lough Foyle in the north-west of Ireland to Carlingford Lough in the north-east, separating the Republic of Ireland from Northern Ireland.
The border at Killeen (viewed from the UK side) marked only by a metric (km/h) speed limit sign
A Sinn Féin protest against a hard border. Post-Brexit border controls are a controversial issue.
A bilingual traffic sign in County Louth, in the Republic of Ireland, warning drivers travelling south across the border that metric speed limits are used in ROI, whereas the UK uses imperial units in driving.