|Intercommunality||Pays de Landerneau-Daoulas|
|Elevation||1–175 m (3.3–574 ft)|
|Land area1||13.19 km2 (5.09 sq mi)|
|- Density||1,137 /km2 (2,940 /sq mi)|
|INSEE/Postal code||29103/ 29800|
|1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km² (0.386 sq mi or 247 acres) and river estuaries.|
|2 Population without double counting: residents of multiple communes (e.g., students and military personnel) only counted once.|
It lies at the mouth of the Elorn River which divides the Breton provinces of Cornouaille and Léon, 20 km (12 mi) east of Brest. The name means "(religious) enclosure of St Ténénan (Welsh: Tyrnog)": allegedly a Welshman who also had llans in the Vale of Clwyd, North Wales and in Somerset, and who moved to Brittany in the 7th century. It was an important centre of the flax and linen industries in the 16th and 17th centuries. Today it is the main agricultural market in northwest Brittany.
A picturesque feature of the town centre is the sixteenth-century house-lined bridge (the Pont de Rohan) across the Elorn.
Landerneau has many bilingual signs (French and Breton), and is the first town where the indications in the local station were made bilingual, as a result of the Ya d'ar brezhoneg charter of the Ofis ar Brezhoneg.
There is a Diwan preschool and primary school in the town.
- The Landerneau Railway Station is situated on the Paris–Brest railway and the branch to Quimper.
- The RN 12; a trunk road connecting Landerneau to Brest and Paris.
- (French) Signalisation bilingue dans les gares : Landerneau, ouvre le bal (Bilingual signalisation in stations: Landerneau is the first one
- (French) Ofis ar Brezhoneg: Enseignement bilingue
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