The island's only land border is between the
Republic of Ireland (RoI) in the south and
Northern Ireland (NI) - which is part of the United Kingdom - in the north east of the island. Its
360kms (224m) stretch from
Lough Foyle on the northern edge of the island to
Carlingford Lough in the east, on the Irish Sea. In common with many internal borders in the European Union, it is very inconspicuous and open by world standards.You must drive on the left hand side of the road on both sides of the border. Beware of the change in speed limits when crossing. All
speed limits in the
Republic Of Ireland are in
kph whilst in
Northern Ireland they are in
mph. TIP: Before crossing the border to NI, fill your petrol tank as fuel is cheaper in the RoI.