Seine-et-Oise

Seine-et-Oise was a former French administrative territory in the Île-de-France region that extended from the banks of the Seine river to the fertile valleys of the Oise. The area encompassed dozens of communes surrounding Paris and was shaped by two rivers that defined its character and development.

The territory was created in 1790 during the French Revolution as a new administrative district. In 1968 its territory was dissolved and split into several new departments that formed the structure of modern Île-de-France.

Versailles was the heart of this territory and drew artists, craftspeople, and servants who supported the royal court's splendid world. The region was known for its gardens, chateaux, and country estates that reflected the power and taste of the aristocracy.

The former territory is documented in French administrative history records and can be explored through archives and historical materials. For anyone interested in understanding how the Île-de-France region was reorganized, archival research and museum visits offer the best approach.

The dissolution of this territory was one of France's largest administrative reorganizations and created the basis for the modern boundaries of several departments. This 1968 restructuring had far-reaching effects on how the Île-de-France region was administered and planned.

Inception: March 4, 1790

Capital city: Versailles

Shares border with: Seine, Eure, Eure-et-Loir, Loiret, Seine-et-Marne, Oise

GPS coordinates: 48.80000,2.13333

Latest update: December 18, 2025 11:41