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La Fontenelle Ar Fantanig  | 
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| Commune | |
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 Birthplace of the composer Jean Langlais
 
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| Coordinates: 48°28′07″N 1°30′06″W / 48.4686°N 1.5017°WCoordinates: 48°28′07″N 1°30′06″W / 48.4686°N 1.5017°W | |
| Country | France | 
| Region | Brittany | 
| Department | Ille-et-Vilaine | 
| Arrondissement | Fougères-Vitré | 
| Canton | Antrain | 
| Intercommunality | Antrain | 
| Government | |
| • Mayor (2014–2020) | Philippe Germain | 
| Area1 | 12.36 km2 (4.77 sq mi) | 
| Population (2008)2 | 539 | 
| • Density | 44/km2 (110/sq mi) | 
| Time zone | CET (UTC+1) | 
| • Summer (DST) | CEST (UTC+2) | 
| INSEE/Postal code | 35113 /35560 | 
| Elevation | 7–117 m (23–384 ft) | 
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 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km² (0.386 sq mi or 247 acres) and river estuaries. 2Population without double counting: residents of multiple communes (e.g., students and military personnel) only counted once. | 
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1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km² (0.386 sq mi or 247 acres) and river estuaries.
La Fontenelle (Breton: Ar Fantanig, Gallo: La Fontenèll) is a commune in the Ille-et-Vilaine department of Brittany in north-western France.
Inhabitants of La Fontenelle are called in French Fontenellois.