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Aside from the 20th century addition of the Bois de Boulogne, Bois de Vincennes and Paris heliport, Paris' administrative limits have remained unchanged since 1860. The Seine departement had been governing Paris and its suburbs since its creation in 1790, but the rising suburban population had made it difficult to govern as a unique entity. This problem was 'resolved' when its parent "District de la region parisienne" (Paris region) was reorganised into several new departments from 1968: Paris became a department in itself, and the administration of its suburbs was divided between the three departments surrounding it. The Paris region was renamed "Ile-de-France" in 1977, but the "Paris region" name is still commonly used today. Paris was reunited with its suburbs on January 1, 2016 when the Metropole du Grand Paris came into existence.

When was the Siene department created?
1790