Seine (department) replaced by Val-de-Marne
Seine is a former department of France, which encompassed Paris and its immediate suburbs. It was the only enclaved department of France, being surrounded entirely by the former Seine-et-Oise department. Its prefecture was Paris and its INSEE number was 75. The Seine department was disbanded in 1968 and its territory divided among four new departments: Paris, Hauts-de-Seine, Seine-Saint-Denis and Val-de-Marne.Dissolution
By 1968 it contained 5,700,754 residents (45% of them living in the City of Paris, 55% in the suburbs), making it by far the most populous department of France. It was considered that the Seine department was now too large to be governed effectively. On 1 January 1968, it was split into four smaller departments: Paris, Hauts-de-Seine, Seine-Saint-Denis and Val-de-Marne.  The latter three also include parts of the former Seine-et-Oise department, which was also abolished at the same time.
The breakup of the Seine department involved the following changes:The city (commune) of Paris was turned into a department in its own right, with no other communes inside this department. The official number 75 which was used for the Seine department was given to the new Paris department.
To the south and southeast of the city, 29 communes of the Seine department were grouped with 18 communes of the Seine-et-Oise department to form the new Val-de-Marne department. The official number 94 was assigned to this department, a number previously used for the Territoires du Sud territory in the Saharan part of French Algeria.
To the west of Paris, 27 communes of the Seine department were grouped with nine communes of Seine-et-Oise to form the new Hauts-de-Seine department. The official number 92 was assigned to this department, a number previously used for the department of Oran in French Algeria.
Finally, to the north and northeast the 24 remaining communes of the Seine department were grouped with 16 communes of the Seine-et-Oise department to form the new Seine-Saint-Denis department. The official number 93 was assigned to this department, a number previously used for the department of Constantine in French Algeria.Taken together, Hauts-de-Seine, Val-de-Marne and Seine-Saint-Denis are known in France as the Petite Couronne (meaning "small ring"), as opposed to the Grande Couronne ("large ring") of the more distant suburbs. The Petite Couronne plus the City of Paris total 762 square kilometres (294 sq mi), more than the former Seine department (480 square kilometres, 190 sq mi).
The Métropole du Grand Paris, an administrative structure created in 2016, comprises Paris and the three departments of the Petite Couronne, plus seven additional communes in the Grande Couronne.
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