Port du Gros Cacouna (47°56'N., 69°31'W.), an artificial harbor enclosed by breakwaters, extends 0.5 mile from the SW end of Ile du Gros Cacouna, with its entrance in the SW corner. A wharf, 274m long, with a least depth of 10.2m alongside, is situated on the E side of the harbor. Occasional icebreaker assistance may be required in winter. The NE part of the harbor dries. The entrance is 170m wide. Range lights, in line bearing 082° and visible only when in alignment, lead through the breakwaters into the harbor.

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