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Dejima (出島, literally "exit island"; Dutch: Desjima or Deshima, sometimes also written as Decima or Dezima) was a small fan-shaped artificial island in the bay of Nagasaki. It was built in 1634. The island was made by digging a canal through a small peninsula. It was the only place of direct contact and trade between Japan and the outside world during the Edo period. Dejima was built to keep foreign traders out of Japan as part of "sakoku" self-imposed isolationist policy. It was built at first for Portuguese traders. It then changed to a Chinese and Dutch trading post from 1641 until 1853. It covers an area of 120 m x 75 m (9000 square meters, or 0.9 hectares) and has now become part of the city of Nagasaki.
"Dejima Dutch Trading Post" is now a Japanese national historic site.