A district called Hameln was established in 1885 within the Prussian Province of Hanover.In 1921 Pyrmont decided in a plebiscite to leave Waldeck-Pyrmont and to join Prussia.The Prussian administration assigned the city to the district of Hameln, which was renamed to Hameln-Pyrmont.The Weser River enters the district in the south, runs through Hameln and leaves in the northwest towards Rinteln.The lion is the heraldic animal of the County of Everstein, which ruled over the territory until 1429.