Seine-Maritime is a French department in Normandy. Previous to 1955 it was known as Seine-Inférieure. The department includes the cloudy plateau of the Pays de Caux and the cliffs of the English Channel coast. There are two sort of landscape the dry cloudy plateaux which are under intense arable cultivation, and generally flat. This is Champaign scenery characterised by huge fields with very few hedgerows. Its olden times, along with its beautiful natural environment, and its lively financial activities, make Seine Maritime a very attractive department. Its immediacy to England, as well as its common history makes it a very popular destination amongst British people.

Seine Maritime is one of the two departments of the Haute Normandie region. It is situated in the north of France, and has borders with the Eure department, the Picardie region, and in the north of the department there is the Channel. The department gathers 1,269,310 residents, called, since 2005, the Seinomarins, living in 745 towns and villages. The administrative centre of the department is Rouen, the sous-préfectures being Le Havre and Dieppe.