Ille-et-Vilaine (French pronunciation: [il e vilɛn] ^ⓘ; Gallo: Ill-e-Vilaenn, Breton: Il-ha-Gwilen) is a department of France, located in the region of Brittany in the northwest of the country. It is named after the two rivers of the Ille and the Vilaine. It had a population of 1,079,498 in 2019.^[3]

Ille-et-Vilaine is one of the original 83 departments created during the French Revolution on March 4, 1790. It was created from part of the province of Brittany.

Ille-et-Vilaine is a part of the current region of Brittany and it is bordered by the departments of Manche to the north-east, Mayenne to the east, Maine-et-Loire to the south-east, Loire-Atlantique to the south, Morbihan to the south-west, and Côtes-d'Armor to the west and north-west – France's shortest administrative department boundary at 20 yards (19 metres), although this was not the case with the department boundary. Also the English Channel (la Manche in French) borders the department to the north.

The department is named after its two main rivers, the Ille and the Vilaine, whose confluence is in Rennes, the capital of the department and of the region. Other important rivers include:

• the Rance, that borders the department in the north-west and flows to the north, creating a deep fjord before reaching the English Channel on the western part of the coast (named Côte d'Émeraude) between the cities of Dinard and Saint-Malo); the Rance river is connected from the west of the department to the Ille river in the north-west suburbs of Rennes with a navigable channel (then the Ille river is channelized to join the Vilaine up to the center of the city of Rennes);
• and the Couesnon that borders the eastern part of the department and which reaches the eastern part of the coast of the English Channel, in the flat Bay of the Mont Saint-Michel.

The department is moderately elevated above the level of the sea, with many hills; however the central part has a dense network of many tributaries to the Ille or the Vilaine from all around the large basin of Rennes. The elevated hills bordering this basin are covered by several old forests now exploited by men for the production of wood. The basin itself is a rich agriculture area, as well as the north-west of the department near the Rance.

In the extreme south of the department the Vilaine goes through a slower decrease in elevation in a small corridor in the area of the city of Redon; in this area, the Vilaine is known for its frequent floods during its recent history, often because of too-intensive draining of agricultural areas around Rennes (some floods also affected some parts of Rennes up to the 1980s due to incorrect management of old equipment of the canal of Ille-et-Rance). To avoid these hazards within inhabited cities, some natural fields bordering the Vilaine in the south of the department are now left floodable, and works for regulating the level have been done including, small artificial lakes with derivation channels, replanting trees in the basin, better management of forests, and regulating the artificial drains made for agriculture.

The population has grown rapidly over the last few decades and was estimated at 1,051,779 in January 2016.

Population development since 1801:

More information Year, Pop. ...

Historical population

Year Pop. ±% p.a. 1801 488,846 —     1821 533,207 +0.44% 1831 547,052 +0.26% 1841 549,217 +0.04% 1851 574,618 +0.45% 1861 584,930 +0.18% 1876 602,712 +0.20% 1881 615,480 +0.42% 1891 626,875 +0.18% 1901 614,000 −0.21% 1921 558,574 −0.47% 1936 566,000 +0.09%	Year Pop. ±% p.a. 1946 578,246 +0.21% 1954 586,812 +0.18% 1962 614,268 +0.57% 1968 653,000 +1.02% 1975 702,199 +1.04% 1982 748,272 +0.91% 1990 797,785 +0.80% 1999 866,111 +0.92% 2006 945,497 +1.26% 2011 996,439 +1.06% 2016 1,051,779 +1.09%
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source:[4][5]

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Gallo is a historic minority language spoken in eastern Brittany. Gallo and Breton are both studied at the University of Rennes.

The President of the Departmental Council is the Socialist Jean-Luc Chenut since the 2015 French departmental elections, re-elected in 2021.

The city of Rennes and its suburbs are the original base of the rapid Socialist growth in the department. The city has been governed by Socialist Mayors since 1977, notably by Edmond Hervé between 1977 and 2008. Since then, the growth of middle-class suburbs have helped the Socialists, who have been rapidly gaining strength in those formerly right-leaning areas.

The right remains strong in a strongly Catholic (clerical) area from outside Redon to Vitré or Fougères. In addition, the right is strong in the wealthy coastal area of Saint-Malo and Dinard.

• Rennes downtown
• The medieval town of Vitré
• Plage de l'Écluse in Dinard
• Legendary forest Brocéliande in Paimpont forest
• Château de Fougères
• The fishing village of Saint-Suliac
• Stone row La Roche aux fées in Essé

• Cantons of the Ille-et-Vilaine department
• Communes of the Ille-et-Vilaine department
• Arrondissements of the Ille-et-Vilaine department