Triel-sur-Seine

Triel-sur-Seine (French pronunciation: [tʁijɛl syʁ sɛn], literally Triel on Seine) is a commune in the Yvelines department in the Île-de-France in north-central France. It is positioned approximately 11 km (6.8 mi) to the north-west of Saint-Germain-en-Laye.

CountryFrance

Area

¹

13.58 km² (5.24 sq mi)

Population

(2023)^[2]

12,206

Time zoneUTC+01:00 (CET)

Quick facts Country, Region ...

Triel-sur-Seine
Commune
Town hall
Coat of arms
Location of Triel-sur-Seine
Triel-sur-Seine Show map of France Triel-sur-Seine Show map of Île-de-France (region)
Coordinates: 48°58′54″N 2°00′25″E
Country	France
Region	Île-de-France
Department	Yvelines
Arrondissement	Saint-Germain-en-Laye
Canton	Verneuil-sur-Seine
Intercommunality	CU Grand Paris Seine et Oise
Government
• Mayor (2020–2026)	Cédric Aoun[1]
Area 1	13.58 km2 (5.24 sq mi)
Population  (2023)[2]	12,206
• Density	898.8/km2 (2,328/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	78624 /78510
Elevation	18–179 m (59–587 ft) (avg. 20 m or 66 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

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The city is known for the "Fête du Flan", literally Flan Party, which takes place every last weekend of September on the banks of the Seine. This is a garage sale. The bakeries of the city have on this occasion several stands on which it is possible to consume flan. The city entered the Guinness Book in 1995 for having made the largest flan in the world (5.10 m in diameter).^[3]