Underground city, Montreal
Overview
 
Montreal's Underground City (officially RÉSO or La Ville Souterraine in French
French language
French is a Romance language spoken as a first language in France, the Romandy region in Switzerland, Wallonia and Brussels in Belgium, Monaco, the regions of Quebec and Acadia in Canada, and by various communities elsewhere. Second-language speakers of French are distributed throughout many parts...

) is the set of interconnected complexes (both above and below ground) in and around Downtown
Downtown Montreal
Downtown Montreal is the central business district of Montreal, Quebec, Canada. It is nearly enitirely located at the southern most slope of Mount Royal and is approximately bounded by Sherbrooke Street to the north, Papineau Avenue to the east, Guy Street or until Shaughnessy Village to the west,...

 Montreal
Montreal
Montreal is a city in Canada. It is the largest city in the province of Quebec, the second-largest city in Canada and the seventh largest in North America...

, Quebec
Quebec
Quebec or is a province in east-central Canada. It is the only Canadian province with a predominantly French-speaking population and the only one whose sole official language is French at the provincial level....

, Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

. It is also known as the indoor city (ville intérieure), and is the largest underground complex
Underground city
An Underground city is a series of linked subterranean spaces that may provide a defensive refuge; a place for living, working or shopping; a transit system; mausolea; wine or storage cellars; cisterns or drainage channels; or several of these. The term may also refer to a network of tunnels that...

 in the world.

Not all portions of the indoor city (ville intérieure) are underground. The connections are considered tunnels architecturally and technically, but are air conditioned and have lighting as good as any building's liveable space does.
 
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