Paris - the urban landscape
Roughly circular in shape, Paris is divided by the Seine, which enters in the southeast and loops to the north before leaving the city in the southwest. The river contains two islands: Île de la Cité and the smaller Île Saint Louis. The original site of Paris was on the Île de la Cité and the adjacent left (south) bank of the river. The Romans established a regional capital here in the 1st century AD, naming it Lutetia. With few topographic constraints on its growth, Paris expanded through the years in a generally circular form and was enclosed by a successive series of walls for defense. On becoming obsolete, the walls were demolished, and their sites were transformed into wide streets and handsome boulevards, creating vital access routes within the city. Until recent years, building heights within Paris were limited to 20 m (66 ft), or about six stories; thus, the city, although densely inhabited, has a low skyline except for outlying new developments, such as La Défense, an area of high-rise buildings that house the offices of many international companies.
A temperate marine west coast climate exerts an important influence on the life of the city. Mild winters (January mean temperature 2.8° C/37° F), cool summers (July mean 18.9° C/66° F), and well-distributed annual precipitation make it possible for sidewalk cafés, open-air markets, and other colorful attributes of the urban scene to be enjoyed throughout the year.
Among districts of the city that have maintained an individual character are the Latin Quarter, or Left Bank, near the Seine, noted for educational and cultural pursuits; the expensive residential and commercial districts of the Right Bank near the Champs-Élysées, such as Passy, Auteuil, and the suburb of Neuilly; and the poorer working-class neighborhoods in the northeastern part of the city, including Belleville and La Chapelle.
Paris has grown steadily, with interruptions caused by war and disease, since it was chosen as the national capital in the late 10th century. The rate of migration to the city increased markedly during the 19th century as the impact of the Industrial Revolution was felt. Migration during this period was especially stimulated by the construction of railroads, which provided easy access to the capital. Paris has long been a refuge for those fleeing persecution and unrest in various parts of Europe. After World War II, however, and well into the 1970s, the city’s population became even more cosmopolitan with the arrival on a massive scale of immigrant workers from Italy, Spain, Portugal, and Yugoslavia and of former colonial subjects from North Africa, Senegal, Vietnam, and elsewhere. This more recent influx has created a variety of economic and social tensions in Paris.