Derry or Londonderry is the second-largest city in Northern Ireland. The old walled city lies on the west bank of the River Foyle. It is the only walled city remaining intact in Ireland and one of the finest examples of a walled city in Europe. It is an excellent walk around the wall that gives very good views of the city landmarks. The half of the city the west of the Foyle is known as the Cityside and the area east is called the Waterside.