Grand Barachois (French pronunciation: [ɡʁɑ̃ baʁaʃwa]) is a large natural lagoon in Saint Pierre and Miquelon.
It lies immediately south of Miquelon Island, and is formed largely by the 12 kilometre-long tombolo of La Dune.
There is an observatory on the shore of the lagoon called the Observatoire du Grand Barachois.
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