Patarei Prison (Estonian: Patarei vangla), also known as Patarei Sea Fortress and Tallinn Central Prison (Tallinna Keskvangla), commonly known as The Battery (Patarei), is a building complex in Kalamaja district of Tallinn, Estonia. The premises cover approximately four hectares of a former sea fortress and prison, located on the shore of Tallinn Bay. The Republic of Estonia, which declared independence in 1918, reconstructed it as a prison after World War I. In 1920, the complex's main function became a prison, lasting until 2002.