According to the city's Royal Charter of 10 April 1662, the official name is "Londonderry".This was reaffirmed in a High Court decision in 2007 when Derry City Council sought guidance on the procedure for effecting a name change.The Walls, which are approximately 1 mile (1.6 km) in circumference and which vary in height and width between 3.7 and 10.7 metres (12 and 35 feet), are completely intact and form a walkway around the inner city.They provide a unique promenade to view the layout of the original town which still preserves its Renaissance style street plan.Derry is close to the border with County Donegal, with which it has had a close link for many centuries.The person traditionally seen as the founder of the original Derry is Saint Colmcille, a holy man from Tír Chonaill, the old name for almost all of modern County Donegal, of which the west bank of the Foyle was a part before 1610.
It is one of the few cities in Europe that never saw its fortifications breached, withstanding several sieges including one in 1689 which lasted 105 days, hence the city's nickname, The Maiden City.
Londonderry railway station is often referred to as Waterside railway station within the city but is called Derry/Londonderry at other stations.
The council changed the name of the local government district covering the city to Derry on , consequently renaming itself Derry City Council.
the court case was seeking clarification as to whether this had also changed the name of the city.
The decision of the court was that it had not but it was clarified that the correct procedure to do so was via a petition to the Privy Council.
This did not change the name of the city, although the city is coterminous with the district, and in law the city council is also the "Corporation of Londonderry" or, more formally, the "Mayor, Aldermen and Citizens of the City of Londonderry". The city is also nicknamed the Maiden City by virtue of the fact that its walls were never breached despite being besieged on three separate occasions in the 17th century, the most notable being the Siege of Derry of 1688-89.).